I use this amp professionally and it seems to have been doing this for some time, but it is so intermittent it keeps catching me by surprise. I play at substantial volume and levels with this amp and get compliments all the time, but every now and then it will just cut sound, like a different channel, but it drops DB and quality and sound and volume really bad, suddenly. Maybe it's just the data cable from the foot switch to the amp, but I'd swear I checked that and the amp did it once with out the pedal hooked up. I have to play it for some time again w/o the pedal to confirm that now, it's so inconstant. Has anybody heard this before? Those data cables get twisted bad after time, been about 6 years, 400 gigs maybe.... lol I will follow up, need to see if I can recreate it w/o the pedal before I go and buy a new data cable... How much are they anyway?