Hi, Recently my phone's alarm failed as the phone turned itself off overnight, even though it was connected to the charger. Te phone felt hot in the morning, in spite of being off and I had to jam the power button for a long time multiple times before it turned on. When the phone turned on, the battery was at 100%. I typically leave the phone on the charger overnight and I have not had this problem before. The alarm was supposed to go off at 7:30, I woke up at 10:30 and found the phone to be off and somewhat hot. I typically do not miss alarms and wake up to them just fine. Thank god it was the weekend, otherwise I could have been fired. Needless to say this can never happen again. I am on vodafone in the UK, model GT-19100, Android ver 4.1.2 I don't know how to check for the version of my firmware. Could someone help me figure out what happened and how to prevent it from happening again?