So, last night I had my first 'signal issue' with the GN. I was laying down watching TV with my phone in my pocket. I guess it was underneath me and was unable to get a signal (speaking of which I should really go for a run today!). Anyway, unknown to me, it was without signal for a good 30-40 minutes....which I only figured out when it started heating up, probably from constantly trying to get a lock. My battery had drained about 20% over this period of time. When I got up, my phone continued draining rapidly, going from 20% to 5% in about 15 minutes. It could not obtain a lock even though I had 2 'gray' bars of 4G at about -93dbm. All this time I had Wifi enabled but the lack of a cell signal was a problem. Even switching to 3G and back wouldn't give me a lock. I had to turn airplane mode on and off to regain my signal.....and then plug back in before it shut down! Anyway, I just thought I would post this for general info. My phone is back to working fine today. My guess is that the problem is related to an extended period of time with no signal....which for some reason causes the phone to be unable to reconnect once the signal is re-established. Or my phone was just pissed off about getting crushed by me.