can't reach server until I reboot it

Hi guys;
recently almost everyday somethings happen to my server and I can't reach it at all. it doesnt response until I reboot it from the hetzner panel, as soon as I reboot it, everything works fine, after a while like one or two days later it happen again.

I tried to check the logs but there are thousands of line logs, I'm not sure where to look exactly, would you please recommend me some things ? why it could it be? which logs should I checkl ? am i under a sneaky attack? if so how can I prove it ?

my server info is below, and my site traffic is not a lot for this server, and there is no sudden unusual traffic increase.

CPU Model: AMD Ryzen 5 3600 6-Core Processor
64GB RAM
CPU Details: 12 Core (2200 MHz)
Distro Name: CentOS Linux release 7.8.2003 (Core)
Kernel Version: 3.10.0-1127.el7.x86_64
CWPpro version: 0.9.8.971

thanks in advance.