Yeah, I had a similar problem with my Little Big Muff. It worked fine for a while and then one day just started doing what you had described, cutting the signal when clicked on and just being a bypass otherwise. I left it alone for a long time (5 or 6 months) and just randomly decided to give it a try the other day and now it’s working perfectly. I have no idea. Doesn’t make me feel very good though-I was thinking about buying a Holy Grail but am kind of reluctant if there is some kind of issue with the consistency of quality.