PVE 7.2.1 Server stuck or restart services

Jan 4, 2021
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Hello
Help me, please, to understend, how to solve next problem:
There are 2 types of problem:
1. In most cases the server "soft restart" all internal services and vm's. In this case for 10-20 seconds crash all vm's, web console, ssh console and autorestarting these ones.
2. A little less often, the server is stucking and i must go to the hoster control panel and restart it manually.
It happens periodically: sometimes every 5-10 minutes, somtimes 1-2 hours.

What i tried:
1. Install other kernel versions (5.15.x, 5.17.x etc)
2. Full reinstall OS (with modules version from iso 7.2.1 and with updated modules from enterprise repo), but it doesn't effect
3. Also i ordered to reinstall server hardware by my datacenter for a new one, but it doesn't effect.

At the moment, i fully don't understand, what i have to do.
Help me, please
 

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