ok, i have an older GK MB2 500, and it's been great, but last night at band practice, i plugged in, turned on and WOAH! ***?!?! it made a sizzling sound and the first note i hit buzzed and hissed like basket full of rattlesnakes. as the note "rung out", the signal would cut out repeatedly. probably 7 or 8 cuts during the decay of the sustained note. the initial buzz-crackle-pop was loud and sizzled like mad. and as the note decayed, the crackling buzzing pops diminished and became fewer and further between. what is going on here?!?! anybody have any ideas? i checked everything. i have the same two cabs (8 ohms each) same power strip, same practice space, same outlet that we've been practicing at for years. never move the gear, never fiddle with anything. same bass, everthing. i'm at a loss? obviously, i stopped right there. didn't practice.