I have the same problem intermittently. I recently discovered it only happens when using my Earbuds, which then disconnects the watch from the phone/Galaxy Wearable App. When I finish using the Earbuds, the app still has them selected but not connected. In this state the app doesn't automatically reconnect to the watch. The watch then keeps retrying to connect, causing the watch to overheat and draw on battery. Once I manually connect the watch via the app, the watch returns to normal.
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