database table wp_ywrr_email_schedule no orders are registered

Hi,
thank you for this usefull plugin, maybe you can help me to understand an issue i found on the last few days
Right 2 weeks before I solved by reading on this support forum the problem of unknown column ‘mail_type on table ‘wp_ywrr_email_schedule’and everithings seems working fine after that ….
Today I check the same db table to see if all was fine and found out this stange issue: after i added the column ‘mail_type’ the plugin have registered only 7 orders on the same date (2020-04-22) even if they were made in different days, and after that stopped at all to work, no orders registered (8 new orders) and so no scheduled review reminder …

Can you please suggest me what can be the problem and how to solve it?

I cheched the server error log but i don’t understand if it is something related or not:
[16-Apr-2020 05:33:56 UTC] status was called incorrectly. Order properties should not be accessed directly. Backtrace: require(‘wp-blog-header.php’), require_once(‘wp-includes/template-loader.php’), do_action(‘template_redirect’), WP_Hook->do_action, WP_Hook->apply_filters, WC_AJAX::do_wc_ajax, do_action(‘wc_ajax_checkout’), WP_Hook->do_action, WP_Hook->apply_filters, WC_AJAX::checkout, WC_Checkout->process_checkout, WC_Checkout->process_order_payment, WC_Gateway_COD->process_payment, WC_Order->update_status, WC_Order->save, WC_Order->status_transition, do_action(‘woocommerce_order_status_processing’), WP_Hook->do_action, WP_Hook->apply_filters, wcpdf_WC_Piva_Cf_Invoice_Ita->generate_invoice_number, WC_Abstract_Legacy_Order->__get, wc_doing_it_wrong. This message was added in version 3.0.
[27-Apr-2020 01:29:50 UTC] WordPress errore sul database Lost connection to MySQL server during query per la query SELECT option_value FROM wp_options WHERE option_name = ‘cookie_notice_options’ LIMIT 1 fatta da require(‘wp-blog-header.php’), require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), include_once(‘/plugins/cookie-notice/cookie-notice.php’), Cookie_Notice, Cookie_Notice::instance, Cookie_Notice->__construct, get_option

Maybe someone can help me to understand?