hi there. I had the same situation.
my gear is galaxy watch lte version.
When I went jogging and connected the watch to play music with my bluetooth earphones, the overheating notice popped up.
may I know if there is any solution to this matter?
Thank you so much for reaching out for assistance.
Can you please send us a private message with the below information here: http://bit.ly/2JH2rq2
LTE or Bluetooth:
This is happening to me too. I've had my active2 watch 2 weeks. Randomly overheats even while resting or doing nothing. Keeps coming up with the message then shuts the device off.