The situation appear when was weekend or holiday, from 24 December, 3 or 4 times until now. I have scheduled an daily report at 7:00 AM, when I dont receive this report I know it's a problem. Latest time when the problem was, I checked the services and PhoneSystem Nginx Server and Database Server had 0 at CPU Usage, Threads and Handles. I restarted Nginx Server service, nothing happend, when I restarted Database Server, the problem where gone and all was working normally. I called my reseller and we did Debian OS updates in hope to solve the problem..but it still appear. Now the mentioned services has 0 in CPU Usage, Threads and Handles
I didnt noticed any high CPU or RAM usage.