[SOLVED] PC often hard-freezing shortly after reboot ?

Jan 18, 2022
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I have a PC, self-built from components, that hard-freezes, seemingly randomly. Sometimes it reboots spontaneously, sometimes it doesn't. Sometimes the mouse pointer works for a few seconds while the rest is unresponsive, then everything freezes. Some other times everything freezes right away.
I tried Linux with console on serial: no messages are printed on the serial when the freeze occurs (I was hoping in some kernel panic message).

The strange thing is that it seems to occur mostly within a few hours after a reboot. If the PC survives the first few hours, it can go on for days and days, and even be suspended and resumed, until the next kernel upgrade that forces a full reboot.
I tried other OSes, namely the NomadBSD FreeBSD live distribution, and the problem exists there as well.

Any suggestions?
 
Jan 18, 2022
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psu: Cooler Master MasterWatt Lite 500
cpu: AMD Ryzen 7 1700
MB: Gigabyte GA-AB350-GAMING
memory: Crucial - DDR4 16 GB 2666 MHz
ssd: Transcend MTS800 256 GB (M.2 connection)
gpu: ASUS EX-RX570-O4G (Radeon RX 570)
 

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