Proxmox freezing randomly

[Ladva]

Hi, my Proxmox mini server (intel n100), is freezing randomly during the day. Can somebody help me solve it? I have no idea what is it causing. Server drops all connections, will not respond to ping

Log before crash is attached bellow

 

[ualex]

I would run memtest and a cpu stress test to check if the N100 does not crash.