Hey guys! A few months ago I bought an F1 from another TB member, it worked flawlessly at first, but now it will cut out if I bump the input jack on my bass while playing. At first I thought it was the jack on my bass, but after trying multiple basses and cables I always have the same problem. If I turn the head off and back on again, it's fine. Until I bump the jack on the bass again. My band has a few big shows coming up and I definitely want to avoid having to run over and turn my F1 on and off again in the middle of a song. Anyone have any suggestions or have the same problem?