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I am changing to a new hardware, and I have the same issue. When the machine boots, I can hear the system beep.

Not sure if the following can provide any clue. Doesn't mean anything to me yet...

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[font=courier][font=courier]root@mygw001:~ # /usr/local/bin/beep
root@mygw001:~ # /usr/bin/beep
beep: Failed to open '/dev/dsp'
root@mygw001:~ # /usr/bin/beep -d /dev/speaker
beep: ioctl SOUND_PCM_WRITE_CHANNELS(1) failed
root@mygw001:~ # [/font][/font]

Well, it seems the issue was the included power adapter. It was a Daijing 60W unit, which I'd think should be plenty (never measured more than 40W draw fully loaded).

I replaced with a Mean Well 80W (GST90A12-P1M) I found relatively cheap on eBay and have not had any further issues. Approaching 5 days uptime now.

How is your experience since replacing the PSU? I have a Qotom that has been running since July 2021. Last few days it started to randomly shutdown. Logs are similar to yours that I'll suddenly see stop and backup scripts. I initially ruled out PSU, since I would expect abrupt power offs instead, and not something that has signs of graceful shutdowns.
Thank you for sharing your experience, I am now going to find a replacement PSU.