Well, I've had this happen to me with one of my guitar amps in the past and now my EBS Taurus is doing the same thing. I turn the power on, no problem, play for a few minutes then the sound just cuts off. The amp is on as indicated by the lights and I can just faintly hear the instrument but no actual sound. I turn the amp on and off and the problem is fixed for anywhere from a few minutes to as long as I'm play. Any ideas to what this may be? thanks G1