i know there was a thread about this in the past. but i didn't want to look for it. so i am at rehearsal today, and i have an ampeg svt4pro (about 6 months new straight from factory) and an ampeg bxt410hlf (new as well), and in the middle of a song randomly, a loud crunchy noise comes and then my speakers light up! this happened repeatedly so i had to call it quits for the day. what is the solution and cause of this problem? what do to need to do? the head has not been abused one bit. it came out of the box, and straight into a rack and has never been dropped or anything. i have baby'ed it from day one! any insight from those who have experienced this problem would be greatly appreciated!