My wife and I have identical SP3s - i5 256gb, both running Windows 10. When we are in the same room, screen movements with pen or finger on my wife's tablet interfere with mine. Her movements cause windows on mine to open and close, sometimes Windows Explorer opens up, photos open, all random stuff as my cursor flies around the screen. I had someone from MS Support remotely access my tablet a few days ago and they said the problem would be fixed with the update they did, but it hasn't. Any suggestions please?