I manage a number of websites for aof clients

I use Vultr.com $5 plan 1 CPU 1 GB
Virtualmin
Basic websites with infrequent use. Although it does look like I got a lot of visits from bots

Anyway each individual client has their own account with their own server for $5

Randomly, at around 2:26 AM every other day or so, 3 out of 8 servers go down completely. Apache error logs empty of anything serious

The servers are in no way connected

the only thing is that all of the configurations are the same of course because I would have the same configuration of course for everyone

I figured the best way to solve my problem would be to have the Ubuntu Server automatically reboot every single day at 3 am or so, and it hasn't helped at all

This is extremely confusing

Also I want to mention that some sites go down less than others. For example I have a very cheap $2. 50 Ubuntu server, running 5 practice sites and that one seems to be every other week, but rarely, despite the RAM and CPU being at 70%+
the most realistic question I could give would be if somebody doesn't know what's going on or what I should look for, is there a script to restart the entire server when it notices that httpd is down?