Question: Does anyone know what would cause a Hartke 2000 head to cut out at random times? Here's the situation: Had a practice-sounded fine. Got to the gig-plugged in and played a bit-sounded fine. Did soundcheck-sounded fine. Plugged in to start the show an hour later, and it was all cracking and popping and cutting out. Had miniature freak-out, and had to use the backup amp. THEN...second set, tried the Hartke again, and it worked fine for the rest of the gig. What gives?? The battery in the bass is fine, the fuses in the amp test okay, my cords are okay, but beyond that, I'm kind of ignorant on electronic trouble-shooting. Seeking your wisdom...Thanks!!