I have a Watch 4 classic 4g and wvery time the watch is used as a stand alone device it overheats within seconds of use and has to " cool down".
Just got mine a day ago. Called Samsung to ask if the overheating problem has been resolved before I even use the watch. Samsung assured me that it was fixed so I activated it which required me to take my watch 3 off my account. Within 2 min of making a call from the watch it over heated and shut down. Do not buy this piece of garbage. Sending mine back Monday. Big hassel because Samsung lied to me.