This is O2 reply for the problem..
I am sorry to here you are having difficulties with your XDA2. It would appear you have already tried everything I could suggest (hard reset, downloading the ROM again etc.) It would seem this is a hardware fault. Please call the XDA repair centre on 08081003427 with whom you will be able to discuss repair/replacement of the unit.
and this was my reply...
Thank you for your e.mail..But it cant be hardware problem ! because I had the same problem with my original XDA II, send it for repare, after THREE MONTHS!!!!! !!! no one could tell me were is my phone and after a very long fight I was givin a new XDA II..downlaoded the new ROM and you know the rest!!! please advice urgentlyyyyy
Any suggestions !!!!!?????