Thank you for you answer, guys! @akshay, I’ll definitely try to do it. Just to be clear - you had the same issue as described above. The issue with the rubber pad discussed with warranty support was something unrelated or did the overheating also affect the crash you mentioned? Regarding the coreboot, can there be also any relation? I’ll do it once I will be able to switch the computer on.
Anyway, Happy New Year!