My device was doing this as well. The proximity sensor was also turing mt screen off even when I wasn't in a call. I exchanged it and continue to have the power cycling issue. The proximity sensor seems to work fine, but if i dont access the phone for 5 or so minutes (unfortunately that's rare) the device will turn off and turn back on. Grrrrrr!! I spoke with a few LG Reps and they stated that they haven't heard of it (sure you haven't) I thought that it must be an app or my pebble watch. I'll try and uninstall my Gmail update. Thanks
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