My phone keeps switching on by itself whilst charging up and beeps randomly. After a while it then freezes with a blue screen and a white band across the centre. I correct the freezing by removing and replacing the battery but the phone hasn't charged up at all, even though it initially showed it was charging up. The phone is approx. 1 year old (need to check whether in warranty etc.) is in good condition and is kept in a protective cover/case. This is happening in two out of three charging sessions. Ericsson have emailed me to say I can send it back for repairs. Is this a good idea? Is it a firmware problem? Any ideas?