My RAZR randomly dies (with full charge)

[GaryGnu]

I have a RAZR V3 (I think its a V3) with AT&T/Cingular. About 2 months ago, the phone started going dead at random times. The phone could be fully charged, and then several hours later, it would be dead, and the only way I could get it back would be to charge it from a 120V wall charger. It would not charge in the car.

Based on what I can see, the battery does not drain all the way down. This occurs with full charge bars, and always occurs when I am NOT using it. The phone is either in my pocket or sitting on a table when it dies, but it never dies when I am using it.

Figuring it might be the battery, I bought a new battery on ebay. This did not fix the problem. I took the phone to a mall Cingular store, and the guy acted like I was the first person to have this problem.

Any ideas?

Thanks.

-- Gary