MySQL passwords invalid, rebooting droplet fixes it

I’m running Vesta CP on a droplet.

I’ve noticed that every few weeks (perhaps monthly), all MySQL credentials—including root—become invalid and I get connection errors on all my sites. if I reboot the droplet, everything works again for a few weeks.

Any idea what’s going on here?

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As the above answer says, it’s very likely that MySQL is being killed by the OOM killer. That means it is running out of memory. You can confirm this by checking /var/log/syslog after this happens. If that’s the case and it really only is happening every few weeks, you probably don’t need to upgrade to a larger droplet. You can probably get away with just adding some swap to the system. This article should point you in the right direction:

MySQL is being killed by the OOM killer.