ok, there are 4 screws on top that hold the amp itself in place. do those need to be tight? my amp cuts in and out. i hit it from the bottom, and it comes back, and the top screws are kinda losse, slightly stripped.

dont those screws make a ground ?
if theyre loose, tighten them. theyre in there for a reason

id attribute it to a weak solder connection before anything else
thats what i was thinking. but i couldnt remember about the top screws. i seem to recall hearing something that it might be aground or something. i havent really worked on amps that much.