Instruct: Classify the given review as either positive or negative.
Query: Sound is distorted

I installed this unit to control a set of Yamaha outdoor speakers, which I had been using for about 6 months with no issues. For whatever reason, everything works fine at first, then after 30 minutes or so, the sound gets distorted. Can't quite figure out what causes the distortion or why it happens after a given amount of time. I'll let the unit sit, and the next day it will work fine. I'm no sound engineer, so may very well be something to do with my setup, but like I said, everything worked fine without the volume control.