Yesterday I connected my AFB. No sound in A/B mode, and Boost switch returned to default position (on/off instead of on/tap/off). On/Off mode was working correctly. I went to the editor and imported the 2 presets I saved for A and B and it was ok again. I'm scared about this happening on stage. I think I could re-assign presets manually, without the computer, but I'm not sure. I connect it once or twice a day, several hours a day, since the very first day (like 2 months ago). This is the very first time I have an issue with it. By the way... the A/B button was very scratchy since day one. Today I used some Contact Cleaner (Residual 0) on it and it worked fine. Now it works as softly as the other one. Thanks!