I have nexus 4 with lollypop installed on it. Yesterday while operating its screen just went to hung state and stopped responding. I could not even power off the phone. Therefore, I let the phone to drain out battery and switch off itself. Then I charged it started using power button. But it is stuck on 5 flying dots, more than an hour. The power key is not responding now. How should I deal with this problem?
Had a similar issue, when battery is high, restarting the phone goes into a boot loop.
I wait for the phone to drain out, and then connect it to power source and switch it on at once. The phone now boots fine. I have no idea why it does that though.