I had similar case, during the night I woke up because felt my Watch 6 started to burn my hand. As I understand it was because my smartphone was in a different room and the signal between them was week or no at all, so watch started to boost signal or connect over WiFi/LTE and that resulted in a higher heat been produced. Also watch was under the blanket as well. I now always leave smartphone in the same room and this issue never happened again.
A Reddit user has claimed that their new Galaxy Watch 8 burned their wrist while sleeping. The burn was so significant that it ripped the skin off the affected area and left a scar. Samsung has reportedly failed to acknowledge the issue.
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