I have a harmonyG XT. I've been using it for about 3 1/2 years. Love it, never had any issues with it. I play live on average about 3 or 4 times a month. But recently, during my last 4 shows, something goes wrong with the unit. My voice sounds like a chipmunk, and cuts in and out, even when I don't have the harmony engaged. When I cut the power to the unit and wait a few minutes, plug it back in....everything is fine again. It's seems to be happening after bout every 2 hours of use. I have never done any updates on the unit. Not sure if that has anything to do with it or not. It's very embarrassing when we have to stop playing in the middle of a song. Hope you can help. Tkanks in advance, Todd.