I'm thinking on, check with a terminal as putty why it fails.
And if I think it's a hardware failure, and only when the box is warm, I would try to find the fault with freeze spray, or with a small fan blowing to a sector.

But if it's still have the original C807 cap, I would replace it.
Because this is the number one fault of these boxes.

And if that doesn't help, I would try another psu.
Nevertheless, because you say that it just works with a cold boot, there's a reasonable chance to find it with a fan.




_________________________
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Johnny B.

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