So for losses of watches through salt water. Have had any luck finding something about it? In comparision to the problem i had with my gear s3 frontier it sounds similar, but without the salt water. In my watch the battery died, would not charge anymore. So i opend it, replaced the battery and left alone for later. So after putting it back together couple of weeks later, still same problem.

As it turned out, battery died and anlong with it the motherboard. I read something about a firm ware crash later. So anyways, properly the same. After replacing the motherboard and the battery the watch should work again.