Overheating while in calls

I have a Gear s2 4g AT&T model number SM-R730A. I have it running in stand alone mode teathered to my BH701 bluetooth headset. My phone is not fast enough to run the Samsung software. The watch overheats in less than 5 minutes when making a phone call. It will vibrate, say phone performance may be slowed, then it switches to airplane mode and drops the call. Do I need to factory reset? If so how, and will this cause the phone to lock until connected to a phone capable of running the software? I have 4 days to send this phone back and need to find a solution, or decide if I want this watch or not.

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