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I'm with @NiLuJe, that's weird.
The first thought that came to mind for me was temperature. If it is overheating you could be getting strange behaviour. I have used my devices on days when it is well over 30ºC outside and was in a non-air conditioned house. I can't say what it was inside, other than "Hot". I haven't noticed any issues my devices under these circumstances. At the other end, someone recently asked about low temperatures as well, but, that was the screen updating much slower than expected.
Humidity was also a thought. But, it is supposed to be waterproof, so I would hope that is not it. But, I would opening the case and checking that the cables are all seated properly, and that there is no obvious damage.
And, I suppose enabling developers mode and turning on some logging could help. There may be some error shown when it happens. I'm not expecting anything, but, it is something to try.
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