Error establishing database connection

My site is experiencing this error frequently, I tried to repair from my-website / maint / repair.php

but these errors returned to me!

toggle_users: 1 client is using or hasn't closed the table properly
toggle_usermeta: 4 clients are using or haven't closed the table properly
toggle_posts: 4 clients are using or haven't closed the table properly
toggle_comments: 1 client is using or hasn't closed the table properly
toggle_options: 13 clients are using or haven't closed the table properly
toggle_postmeta: 4 clients are using or haven't closed the table properly
toggle_term_taxonomy: 4 clients are using or haven't closed the table properly
toggle_term_relationships: 4 clients are using or haven't closed the table properly
toggle_termmeta: 3 clients are using or haven't closed the table properly
toggle_woocommerce_order_itemmeta: 1 client is using or hasn't closed the table properly
toggle_wc_product_meta_lookup: 4 clients are using or haven't closed the table properly
toggle_wc_reserved_stock: 1 client is using or hasn't closed the table properly
toggle_actionscheduler_actions: 8 clients are using or haven't closed the table properly
toggle_actionscheduler_claims: 8 clients are using or haven't closed the table properly
toggle_actionscheduler_logs: 7 clients are using or haven't closed the table properly
toggle_wc_category_lookup: 1 client is using or hasn't closed the table properly

I need urgent help please!