Fail for me. I got my 928 back in early January and I had two brief encounters with an unresponsive touchscreen, both within the first week I had it. Tweaked some settings based on some advice here (main one was turning off double tap to wake) and had no problems...until I installed the 8.1 developer preview. I was rewarded with phantom back/Start button presses, occasional overheating and unresponsive capacitive buttons. I tried a hard reset on 8.1, which alleviated the symptoms for a short time (couple of days), then tried to bail out and revert to WP8, but the problems persisted and now it's in Nokia's hands. I'm hoping they will honor the warranty. Installing the DP was a huge mistake, given the phone ran like a champ before that time.