I had this same problem on my S8 - two-weeks after the 2-year warranty expired! What a hassle trying to find someone to fix this. Samsung said if I mailed them the phone then *might* be able to do something even being out of warranty. Well, all that takes way too much time. I found a local shop replaced the battery and reglued the top and back plates. The phone looks and runs like new. $80.00 out the door. The repair guy said he'd had a number of S8's some in with the problem and, in fact, had had one come in earlier in the same morning I arrived. It appears this is a common problem. All that said, is this a faulty battery? Something I did? I didn't think it possible to "overcharge." There must be circuit to prevent that. Any idea why this happens so frequently? The repair guy suggested a standard replacement of the battery every two years. Probably not a bad idea. Because, I am not paying $1,000 for a stupid phone. I belly-ached about coughing up the cash for this S8. It's a phone, people, not the Magna Carte.
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