This just started today. I took my phone out of my pocket and it was shut off. I tried to turn it on and it wouldn't do anything so I took the battery out and tried again. It started booting so I put it back into my pocket. I did this three times today and I'm not sure if it fully started up or not because I was at work and didn't have time to watch it boot. Anyways when I got home I turned it back on and it froze at the lock screen. It got to updating the time and it said no service and froze then 30 seconds to a minute later it shut down and wouldn't start without removing the battery. I did a factory reset by holding down the volume down button and pressing and releasing the power button. The problem is still occurring. Any suggestion? I've had no problems prior to this. Thank you