I have a Genz Benz Shuttle 6.0 which is about a year and a half old which is having issues. I shut it off a couple of days ago and it was working fine. I started it up last night and the sound is very fuzzy and the master volume barely works at all. I am plugging into a Genz Benz 2X10 8 ohm cabinet and an old Music Man 4X12 8 ohm cabinet for home practice. I play a couple of times a month and use the same setup except instead of the music man cabinet I use a 4X10, 8 ohm Carvin cabinet. Any ideas what might be wrong?