I'm having the same problem. Tried rebooting, hard reset,and factory reset. Noticed also that when doing palm touch on the whole screen, it cannot sense that my palm is already pressed. Watch face changed on its own, apps keep opening like phantom touch. Just got the watch on January.
I have also same issue. I tried everything. Also this issue happened without any water or physical damage to the watch, so my guess is, software issue. please let me know if there is any solution.