I'm using a Genius SW 1250 speaker set and today my subwoofer just went full mute. I've tried to plug out-plug in, tried to disconnect-reconnect all the cables, no result so far. The 2 front speakers working just fine, but the sub sometimes mutes or comes back for a few seconds, but with crackling sounds. When I turn on the speaker set, I hear the sub pops, so it I'm not suspecting some blown circuits or whatsoever. 2 things that I'm suspecting: 1.) I've turn on sleep mode on my PC (just for a few minutes though) or 2.) I've set up a router next to the speakers amp. Please help me out and thanks for the advices!