My Forerunner 255 (had it since the fall of 2023) has started behaving strangely. It started freezing and would need to be reset occasionally. Now it won't go more than an hour or 2 without shutting itself off and getting really hot (uncomfortably hot to have on my wrist). When it turns on, the battery level goes down to about 1%. A while ago, a small mark appeared in the top right (not sure if it's related). Is this fixable, or is the battery or some other circuitry dead?
