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i had a guy stop in the shop the other day with that same amp and he was having the same problem......he had a 2 ohm load on the bridged output...

if the amp is bridged, it's only stable to 4 ohms, most likely.
ensure he's using a 4 ohm load. That would be:
a single coil, 4 ohm sub or
a dual 2 ohm coil sub with coils in SERIES.

If he has a dual 4 ohm coil sub, he either has a 2 ohm load (I'm guessing this is his issue right here) with the coils in parallel, causing the amp to shut down, or he has an 8 ohm load with the coils in series.

Need to verify the load per coil, number of coils on the sub, and how it's wired.

what is the min ohm rating on the amp it sounds to me like an impedence issue

ok, here is the set-up my nephew has. 1 Power Acoustik LT980/2 amp powering a Alpine Type-S 12" dual 2ohm in a sealed box. All of a sudden the amp starting going into protection mode, then out, then into it again... the amp seems to only being doing this when hooked up to the Alpine (wired in a 4ohm configuration)(SP?) because he hooked it up to a pair of 10" RF subs he had laying around... Is the sub no good anymore or is there another other possiblities? I havent tried hooking the sub up to my amp yet to see if it still works...thats a project for tomorrow but i thought id check to see what you guys thoght. thanks