Is my D2 dying?

For the past few weeks, I've been having the strangest problem with my Droid 2 and I'm thinking it may be kicking the bucket. It started happening on the CM7 GB rom, but continues after SBF'ing multiple times. What happens is the phone freezes up and the screen goes black shortly after. The soft key lights and the backlight stay on. I can use the lock/unlock button to turn these lights on or off, but the only way to fix it is with a battery pull. Eventually, it happens again any way. I've tried playing with overclock settings to see if it was the problem, but neither stock, overclocked, or underclocked make a difference.

Any help would be appreciated. I still have a year until my upgrade :erm (1):