As @user141569 mentions I have a similar problem and my watch was also in water shortly (maybe an hour) before the problem arised. I did not mention it because I didn't think it was related, because the Bangle was in water several times before and it was fine.
Yeah, same here. Mine started bootlooping seconds after being pulled out of the water. It was also in the water a few times before and it was fine. I guess no swimming really means absolutely no swimming of any kind, not even light swimming.
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As @user141569 mentions I have a similar problem and my watch was also in water shortly (maybe an hour) before the problem arised. I did not mention it because I didn't think it was related, because the Bangle was in water several times before and it was fine.