My Lumia 1520 sometimes starts randomly going into and out of applications and the home, back, and search touch do not work. I can put my phone down and it will go from messaging, to cortana, to the screen where you hold down the back button, back to something else. I have to lock and open to get it out of this or sometimes do a reboot. I'm running 8.1 developer and have done every update. This started sometime after the last update. Anyone else seen this or have any magic to fix it?
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