xyzulu LEt me share a stereotype with you
1) He is greek
2) Most Greek websites run on GPL(cracked) Plugins and themes 80% approximately
3) He has no limits per website on resources
4) Once of the website probably creating too many nproc and causing the issue
5) I might be wrong and he is the exception, so then one or more websites consume allavailable resources, updating to V12 is good idea ofcourse but won't solve his problem