I have a Galaxy Note 4 running Android 5.1.1. with Samsung TouchWiz Home 1.0. All of a sudden, I get a message on the screen that says TouchWiz has stopped and I lose the ability to use the touchscreen. I have to fiddle with the buttons on the bottom or sometimes restart the phone. I went to the AT&T store today for some help and was asked if I had tried to remove the battery, put it back, and restart the phone. I told the rep that I have two batteries and I swap them out every other day. His only other answer was that problems like this crop up in Android phones when they get older and there wasn't anything he could do. My phone is only 10 months old. I tried clearing the cache in TouchWiz and that hasn't helped. Would appreciate help from anybody who has an idea of how to fix this problem.