It was working fine all morning until I found it had shut down in my pocket around noon. I then tried to restart it but was only shown the google logo and start up animation before it shut down again. After trying around three times, it opened up to the lock screen and said that it was 9:00 AM January 1st, 1970. It then shut off again. I turned it on more than a dozen times all with same result as my first attempt until it finally brought me back to the lock screen. I was able to change the date and time and it seemed to be working fine for a while despite having the google logo form the start up flashing rapidly in the middle of the screen. It then shut off again and I wasn't able to get it to turn on past the google logo until it eventually wouldn't show anything at all. As soon as I went home I plugged it into the charger and turned it on. Success. I used it for a while testing it until the charge was close to 100%. As soon as I unplugged it, the phone shut off and wouldn't turn on again. When I plugged it in again and turned it on the charge was at 76%. This is the best description I can write as I honestly have no idea what to do. I'd greatly appreciate some help. Thank you!