Cannot create a local snapshot

We are having trouble with creating a snapshot of our site, every time we try to create one, we get the error message:
PHP did not respond properly to the request. As a result, Apache considers the PHP-FPM service to be unavailable.
We have already tried changing the memory limits and max_execution_time in our php.ini settings for the server, makes no difference
also, we have tried running our site on PHP 7.0 and 7.2.
After checking server logs, I've found that it appears that the mysql connection gets dropped
[Note] Aborted connection **** to db: '***' user: '***' host: 'localhost' (Got an error reading communication packets)