Now this may be pure coincidence or not, but I hope it is.

Yesterday I received the FM transmitter for my iphone that I ordered through ebay, lets me listen to all my music in car. Tried it last night, working great.

I then updated my phone to the latest OS (forget what specific number it is) last night and let it fully charge via USB port.

Used the FM transmitter on the way into work, plugged into the power socket in the car. I noticed when I got to my work for some reason my phone had re-set to midnight or thereabouts on the 1st January 1970.

I noticed the phone felt hotter than normal today, charge dropped really quickly so I put it on to charge on way home. Still wouldn't start up once home so plugged it into wall socket and left for 1hr, no charge yet.

Luckily still had time to get into O2 shop and it's now away for repair (7-10 days, feel like I've lost my arm!).

Firstly has anyone had the same type of problem?

And would it perhaps be something to do with FM transmitter, OS update or a completely unconnected problem?