Crate flexwave 120 head sound cuts out

I also have this same problem, it really is upsetting. I traded alot of instruments Epi Special 2, Schecter Damien b-2, jackson RR v, B.c Rich warlock, an older beringer tube amp, and a ibenez weeping demon pedal. For a crate flex wave 120h (half stack) i had it for bout 2 months nothing wrong then all of a sudden, i turn it on and volume fluxes up and down on its own i also notice the reverb cutting in and out when this happens. I cant use warranty because even though owner of the store gave me registration card for it, he never gave me a receipt cause it was a trade in, so i cant send it away. Also just like this guy said when you press in on a knob (any knob, not just the channel you are on, it will go to full volume again. I am puzzled at this problem and searched on the web for days not much on the subject. I only use for practice never leaves volume of 4, never gigged never moved. I would like to maybe fix this problem as now i feel stupid for trading all that gear for an amp don't want to loose this amp. Also it was a brand new amp not preowned. Please Help......

You have a broken solder joint. You'll have to disassemble the amp enough to get at the soldered side of the circuit board that the controls are mounted to and touch up any suspect solder joints. Just be sure to resolder only the joints that were originally soldered or need to be soldered. Hope this helps.