Gear S3 Frontier. Same issue. Got this watch for xmas 2016 and just started using it recently. Battery has been dying quickly and even though the gear app said it had over 1 day remaining it would die in under 8 hours. Was not paying much attention to the "lights" until today. Last night I shut to down completely and set it in the cradle. When I woke up this morning I had a flashing RED light and the watch listed itself as 92% charged. I took it off the charger and re-inserted it. It showed a steady red for about three minutes and then return to flashing red. Wiped the cradle and back of watch with alcohol and put the watch in the cradle with buttons down. this did NOT help and I was greeted with a flashing RED after about three minutes. Remembering that my wife had an S2 I tried her cradle and Wala. Solid green light in about 10 minutes. So, it appears (and hopefully this is the case) that it may be an issue with the cradle. I have a 2nd cradle that is in my travel bag and I'll give that a whirl and report back. For reference the gear app after connecting to my phone shows the battery at 99% with 2d15h24m remaining. Hit refresh prior to posting this reply and it is already down to 96% with 1d19h19m remaning.
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