Friends, need help with crashing PC, any diagnostic ideas?

I've got one all-in-one HP PC, it crashes randomly: sometimes after 15 minutes, sometimes after hours. Crashes are either complete freezes, or reboots. Data surely gets corrupted when that happens.

It's a Windows box, event log contain no details, except about abnormal restart being detected after it happened.

CPU, Memory, SSD?

#asknostr