hey all, I've got a gk mb 800 I've owned and gigged pretty heavily over the last 5 years. About a year ago it started giving me problems, with the sound almost cutting out, where it was Bearly audible with what sounded like all of the lows cut out, to farting out really bad. This isn't consistent, where it might act up for a while, then work fine for a couple of weeks or so before going back to usually the low volume sound. It sounds distorted at times too. I've gone through my entire rig, troubleshooting gear until I finally have it pinpointed in the mb800 as the culprit. It's not buzzing or making any high pitched sounds as I read have been some issues in the past. It have been a good amp and I'd like to get it fixed, I'm just wondering if anyone has any ideas where this might be coming from. At one point the power switch wouldn't shut off so I took it apart and fixed the little spring mechanism. The power button has been working fine ever since so I don't suspect the issue is there. Is this something I would have to go through gk for?