Every 20 times or so using my looper pedal, I get this horrible feedback sound. When I delete that loop and set another loop, it is followed by a different but equally unpleasant static sound. Once I reset that loop and record a third, new loop, the sound disappears and then works properly until it does it again another 20 recorded loops or so later. I’ve actually brought it in to the shop and replaced it, but my new one does the exact same thing! Has this happened to anyone else?