I have another problem mentioned in the thread is that sometime mysql is very slow, causing slow page loading.Some time it's very fast and some time is very slow:
Generated in 9.5697691 seconds (1.13% PHP / 98.87% MySQL)
if it's fast, it takes only 0.05 seconds
I think 500 error is because mysql load so slow and slow down the whole script and the script gets killed.
It was very fast when all servers after the server update and that is why i use x10hosting. Then it suddenly shows what i mentioned above. I think some users may be spam and try to slow down the website or they install some scripts that use a lot of server resource or may be they install too many extension in a script, etc. please check if your users have those problem
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And cpanel adds a subdomain when i add an addon domain, I don't need that but how can I stop it?
and sometime 500s show up instantly
Thank you