Several times a week I have to do a soft reboot. Seems to help for a bit. Example of problem: Try and start Words w/friends, and screen just stays dark after I touch the icon. Happens with different apps. Not sure if it is from the same problem, but a few days ago I had to make a call, hit the dialer to connect and nothing. Reload and same. Several times. Did 2 soft reboots and no change. Then I plugged it in to charger (battery was at 90%), and it seemed to reset the whole thing.