Ok heres the problem I'm haveing I just bought a new cab the other day a swr workingmans tower. And have a GK700rb head. And I was playing for about an hour and all of a sudden I had no sound for about a second or two. Than I had sound again couple of minutes later had no sound again for a bit longer this time... Its like somebody was pushing the mute button on the amp. No noise before the sound quit or before it came back on.. Any thoughts on what the problem is. Is my GK head going?