It all started yesterday evening... My 14 month old S3 randomly started playing music from Google Play, without any prompting. Every time I pressed pause it stopped then pressed 'back' to exit the app it started playing again.
I eventually closed the app and went to charge the phone. It wouldn't charge. I found a different charger. It charged. At 2am this morning I was woken by the music, except a totally different play list from before. It was fully charged. I stopped the music and unplugged the phone from the charger. At 5.30 am it was on critical battery, 7%. I tried 3 different chargers. None of them worked. I put a different battery in- 70% charge. I realised there was a big problem so switched the phone off. I came in this evening and the battery is dead. My wife said she saw a large android robot icon on the screen earlier with a message something like 'don't switch off this target, it is reloading'.
Has anyone any idea what has happened and how I can get my phone back? I have 2% battery on one cell left. Should I try a 'factory reset'?

I eventually closed the app and went to charge the phone. It wouldn't charge. I found a different charger. It charged. At 2am this morning I was woken by the music, except a totally different play list from before. It was fully charged. I stopped the music and unplugged the phone from the charger. At 5.30 am it was on critical battery, 7%. I tried 3 different chargers. None of them worked. I put a different battery in- 70% charge. I realised there was a big problem so switched the phone off. I came in this evening and the battery is dead. My wife said she saw a large android robot icon on the screen earlier with a message something like 'don't switch off this target, it is reloading'.
Has anyone any idea what has happened and how I can get my phone back? I have 2% battery on one cell left. Should I try a 'factory reset'?
