x360 r1 sf4 te losing charge, double inputs

I have a round 1 madcatz xbox360 sf4 te and recently I've noticed when holding a button (short) for zero busters it will randomly drop the charge and release the buster. I thinkit may be inputting twice sometimes too, which may be related. Is this a known issue, and is there a fix? It's happening on 2 different sticks (same model).