I did get these unexpected "Disk Failed" and "Disk Unplugged" errors as well, as described in my previous post.
As I was tinkering with my QNAP (TVS-873), I opened the case and noticed a more stable environment pretty quickly after that (the array was actually booting just fine).
Adding an additional (very big) fan on top of the open case, actually made all components drop significantly in temperature (see table below).
As of that moment, my QNAP is running very stable, and I'm not longer seeing these errors.
Removing the fan however, made the array less stable again within a few minutes, and closing the case brought me back to the disappearing disks.
Now the "normal - closed case" temperatures and "extra cooled - open case" are in a very normal range, I would think anyway.
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Normal cooling Extra cooling CPU ~ 43 C ~ 30 C Disks ~ 38 - 44 C ~ 32 - 38 C M2SSD ~ 36 C ~ 50 C * all temps in Celsius
The PSU however becomes pretty hot.
Also note that I have a old TS869Pro running, with the exact same brand/model disks, and that one shows a higher CPU temp (different CPU, so no surprise there) at 52 C, and the disks are in the 35 - 38 C range (closed enclosure, no extra cooling) and runs just fine.
Since QNAP will charge an absurd amount of money for it's RMA services, I'm wondering if an extra fan could an alternative the solution.
Any advice/insight is most welcome.