Crate Flexwave 120h (Half Stack) volume issues

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......