Hi all. I've had these 5.1's since about october (I bought a set when they first came out, but the sub was a dud ). These ones have been working great, up until this afternoon. Now every ten to thirty seconds or so, the front, center, and rear speakers stop playing, but the sub keeps going. Ten or thirty seconds later, the missing channels come back in like nothing's happened. Is this a temporary problem I can fix, or am I stuck with another set of duds?