My website goes down when I'm trying to create a snapshot

I am trying to create a once off Snapshot, but my site goes down every time I try to do it and it doesn’t complete the request.

I’ve tried to deactivate all plugins and switch the theme, but it doesn’t help.

There are a lot of such waringins in the debug.log

PHP Warning: Error while sending QUERY packet. PID=51613 in ***/wp-includes/wp-db.php on line 1924