I've had an issue with any phone call if I go to desktop with it. Say I'm on a call, press the home key or whatever to pull up contacts, messages, mail, etc, I then have no way of getting back to hang up the call. If I try to swipe down the top bar, the phone locks. If I hit unlock, the phone's screen flashes on, then about half a second later unlocks. It does this over and over with no way of getting the phone to let me unlock it. Occasionally if I'm quick enough I can slide down to get it unlocked and see the desktop, but then it locks immediately again. Halp?