Thanks for prompt replies.

1. I haven't understand what is meant by this " try to flash a new firmware .if not reheat or re-ball power I.C " ??? Can you more elaborate ? Thanks.

2. It turns off completely like reboot....and i make it come back to normal by removing battery and insert it again. I haven't done any installation to my device yet. Not sure where it has problem.
Earlier, it happened twice a day and now it is happening once in an hour and getting frustrated with this problem. Please help !!!

Your inputs are appreciated guys.

Thanks again
Nag