So I have this amp, a crate rfx120, I absolutely love it and I've used it for about 2 or so years. It has a bit of a hiss issue on the solo (heavy distortion) but nothing I can't fix with a noise reduction pedal.

Recently though, the strangest thing is happening, completely randomly I hear EXTREMELY LOUD, high pitched screeching noises. Ive tried multiple guitars, same issue. Also, if I put the gain knob past the halfway point, the amp starts to crackle and give off sounds similar to when you jiggle a cable at the input jack of a guitar.

Im really perplexed...and the local guitar luthier/repairman is a ditz....what can I do?
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