Well yeah no idea what I could have used as a title as it is hard to describe the Problem shortly. I have a Nexus 4 and since two days there seems to be something wrong with the phone. First time I noticed was after I put my phone with 99% power level on my desk only to find it with ~10% left the next morning showing me facebook messenger which didn't work any more having sucked out more than 60% energy while not even being started oO! than later I noticed a loud music playing and thought my GF was listening to music but no it was Whatsapp which made the music even thought I ALLWAYS have my phone on silent (not even vibration, fully silent) plus I never switched the whatsapp sound to some music anyways ... well turned it off again switched the music back to that *beep* sound or whatever only to get waken up at about 11pm by that loud whatsapp music again ! I downloaded Avira Antivirus and scanned everything without any findings. So currently I am thinking of formatting the phone but I would prefer not to and if it is some weird guy hacking into my phone I don't think formatting would solve the problem.... any idea what I can do or any idea what is actually happening with the phone ????