I had the same issue with the Thunderbolt. The power button was always screwy, and after 1 year the phone (which I treated like a baby) just started going into boot-loops for no reason (lousy build quality). Of course I tried to bring it back, but they determined that it was rooted, and did nothing for me. Caveat Emptor, but I refuse to get another HTC product, ever again.
I'm now on a Galaxy Note 2 (one of the best android devices I've ever had) and I still like Motorola products (I've had the OG Droid, Droid 2, and RAZR Maxx). My daughter now has my RAZR MAXX, and I still have my Droid 2 (work provided phone) as a daily phone, along with the Note 2. I've even powered up the OG Droid, and it is still solid.
Cheers,
B.D.