Hello, @santsfirm

What you definitely need to do is to examine the MySQL error log and track down any logged errors. The location of the MySQL error log should be:

/var/log/mysql/error.log

but you can also use this command via ssh and it will show you the location of the MySQL error_log:

mysql -se "SHOW VARIABLES" | grep -e log_error

You can check if the droplet/server is not exhausting the memory, a way to check this is using htop / top or free -m

When the issue occurs you can quickly check the memory usage and examine the MySQL error_log as well. If you do not expect a lot of traffic or busy MySQL activity then the error should be logged in the log.

Hope this helps. Let me know how it goes.

Regards,
Alex