[I9505]Phone acting awkward. Turning off itself and not turning on after 5.0.1 update

Hi guys, after updating to 5.0.1 (XXUHOE3) via OTA the phone turns off itself a lot and then doesn't turn on again or if it doesn it gets off rightaway, it turns on if connected to charger but that also doesn't work sometimes and it gets heated up A LOT after the update.

Thank you