Site down due to plugin

Hello, our page stopped responding at some point, restarting the server helped for a few minutes, but the source of the problem was looped database queries from the plugin:

| 419 | site_name | localhost | site_name | Query   |  310 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 421 | site_name | localhost | site_name | Query   |  306 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 422 | site_name | localhost | site_name | Query   |  308 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 426 | site_name | localhost | site_name | Query   |  304 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 427 | site_name | localhost | site_name | Query   |  302 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 428 | site_name | localhost | site_name | Query   |  301 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 431 | site_name | localhost | site_name | Query   |  302 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 435 | site_name | localhost | site_name | Query   |  299 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 442 | site_name | localhost | site_name | Query   |  300 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 445 | site_name | localhost | site_name | Query   |  292 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 448 | site_name | localhost | site_name | Query   |  299 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 452 | site_name | localhost | site_name | Query   |  296 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 472 | site_name | localhost | site_name | Query   |  291 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 477 | site_name | localhost | site_name | Query   |  291 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 482 | site_name | localhost | site_name | Query   |  289 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 487 | site_name | localhost | site_name | Query   |  284 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 488 | site_name | localhost | site_name | Query   |  289 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 489 | site_name | localhost | site_name | Query   |  283 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 492 | site_name | localhost | site_name | Query   |  290 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 493 | site_name | localhost | site_name | Query   |  289 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 508 | site_name | localhost | site_name | Query   |  285 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 513 | site_name | localhost | site_name | Query   |  283 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 515 | site_name | localhost | site_name | Query   |  283 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 516 | site_name | localhost | site_name | Query   |  282 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 519 | site_name | localhost | site_name | Query   |  281 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 540 | site_name | localhost | site_name | Query   |  280 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 546 | site_name | localhost | site_name | Query   |  276 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 549 | site_name | localhost | site_name | Query   |  277 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 562 | site_name | localhost | site_name | Query   |  277 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 563 | site_name | localhost | site_name | Query   |  276 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 568 | site_name | localhost | site_name | Query   |  274 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 574 | site_name | localhost | site_name | Query   |  270 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 575 | site_name | localhost | site_name | Query   |  275 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 576 | site_name | localhost | site_name | Query   |  275 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 578 | site_name | localhost | site_name | Query   |  275 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 579 | site_name | localhost | site_name | Query   |  275 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 580 | site_name | localhost | site_name | Query   |  274 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 582 | site_name | localhost | site_name | Query   |  271 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 586 | site_name | localhost | site_name | Query   |  270 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 587 | site_name | localhost | site_name | Query   |  270 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 594 | site_name | localhost | site_name | Query   |  268 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 603 | site_name | localhost | site_name | Query   |  265 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 618 | site_name | localhost | site_name | Query   |  261 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 619 | site_name | localhost | site_name | Query   |  260 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 625 | site_name | localhost | site_name | Query   |  259 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 632 | site_name | localhost | site_name | Query   |  255 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 633 | site_name | localhost | site_name | Query   |  255 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 635 | site_name | localhost | site_name | Query   |  255 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 641 | site_name | localhost | site_name | Query   |  250 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |
| 642 | site_name | localhost | site_name | Query   |  247 | Sending data | SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term |    0.000 |

Sample query content:

SELECT COUNT( DISTINCT wp_posts.ID ) as term_count, MAX(term_relationships.term_taxonomy_id) as term_count_id FROM wp_posts  LEFT JOIN wp_term_relationships ON (wp_posts.ID = wp_term_relationships.object_id)  LEFT JOIN wp_term_relationships AS tt1 ON (wp_posts.ID = tt1.object_id)  INNER JOIN wp_term_relationships AS term_relationships ON wp_posts.ID = term_relationships.object_id LEFT JOIN (SELECT wp_braapf_product_variation_attributes.parent_id as ID, wp_term_taxonomy.term_taxonomy_id as term_id, MIN(out_of_stock_var.out_of_stock) AS out_of_stock FROM wp_braapf_product_variation_attributes LEFT JOIN ( SELECT filtered_post.post_id as var_id, filtered_post.parent_id as ID, COUNT(filtered_post.post_id) as meta_count,
 max(filtered_post.stock_status) as stock_status, max_filtered_post.max_meta_count,
 IF(max_filtered_post.max_meta_count != COUNT(filtered_post.post_id) OR max(filtered_post.stock_status) = 0, 1, 0) as out_of_stock FROM wp_braapf_product_variation_attributes as filtered_post INNER JOIN ( SELECT post_id as ID, COUNT(post_id) as max_meta_count FROM wp_braapf_variable_attributes WHERE attribute IN ('pa_rozmiar') GROUP BY post_id ) as max_filtered_post ON max_filtered_post.ID = filtered_post.parent_id WHERE filtered_post.meta_value_id IN (0,125,264,273,207,90,147,91,202,92,93,94,95,96,97,141,142,210,146,124,215,282,245,251,292,239,177,266,204,242,271,236,163,198,167,287,179,165,203,181,237,174,205,178,286,183,229,161,244,194,280,201,102,101,246,184,267,182,265,213,278,220,199,176,162,263,260,180,208,284,197,268,100,232,209,214,103,99,98,175,269,150,247,185) GROUP BY var_id ) AS out_of_stock_var ON wp_braapf_product_variation_attributes.post_id = out_of_stock_var.var_id INNER JOIN wp_term_taxonomy on wp_braapf_product_variation_attributes.meta_value_id = wp_term_taxonomy.term_id WHERE wp_braapf_product_variation_attributes.meta_value_id IN (0,125,264,273,207,90,147,91,202,92,93,94,95,96,97,141,142,210,146,124,215,282,245,251,292,239,177,266,204,242,271,236,163,198,167,287,179,165,203,181,237,174,205,178,286,183,229,161,244,194,280,201,102,101,246,184,267,182,265,213,278,220,199,176,162,263,260,180,208,284,197,268,100,232,209,214,103,99,98,175,269,150,247,185) GROUP BY ID, term_id HAVING out_of_stock = 1) as out_of_stock_variable on wp_posts.ID = out_of_stock_variable.ID AND term_relationships.term_taxonomy_id = out_of_stock_variable.term_id WHERE wp_posts.post_type IN ( 'product' ) AND wp_posts.post_status = 'publish'  AND (
  wp_term_relationships.term_taxonomy_id IN (33,51,58)
  AND
  wp_posts.ID NOT IN (
                                SELECT object_id
                                FROM wp_term_relationships
                                WHERE term_taxonomy_id IN (7,9)
                        )
  AND
  tt1.term_taxonomy_id IN (93)
)  AND wp_posts.ID NOT IN 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AND term_relationships.term_taxonomy_id IN (125,264,273,207,90,147,91,202,92,93,94,95,96,97,141,142,210,146,124,215,282,245,251,292,239,177,266,204,242,271,236,163,198,167,287,179,165,203,181,237,174,205,178,286,183,229,161,244,194,280,201,102,101,246,184,267,182,265,213,278,220,199,176,162,263,260,180,208,284,197,268,100,232,209,214,103,99,98,175,269,150,247,185) AND out_of_stock_variable.term_id IS NULL GROUP BY term_relationships.term_taxonomy_id

What caused this?