Turn the phone off and connect to the charger.
-Hold power + Vol Up until the phone turn on and then release power but not volume.
-You will see and ****ed up android. Hold power and press vol up for 3 seconds and release volume up.
With this you will be in the recovery. With the vol keys go to "Perform a Graphic Test" and press power to execute. It is kinda weird but it doesn't perform a graphic test, it just reinstall a update or something
So if you are experiencing some weird behavior you can try this and see if it solve it.