We have a Azure based VPS instance (2vCPU, 4Gb RAM, SSD 30 GB) with an up to date Ubuntu 18.04, a fresh Hestia install with Prestashop e-commerce and a single domain.
User traffic is fairly low, about 100 visits/day to the e-commerce site and average CPU load is about 7% .
Every 5 or 6 days, around 15:30 hours (+/- 10 mins) we are left with a hung server and the only course of action is to turn off the instance and restart it.
We have disabled all mail services, increased max_children to 20 (we were receiving errors in PHP log, “server reached max_children setting (8), consider raising it”) and checked that there aren’t any cron processes running at that time.
Has anything like this happened to anyone? Any idea where to investigate the problem?