Last night was the second gig in a row where I've had the same issue with my M9, so I'm hoping there is a fix for it. In one of my scenes, I have the top middle preset setup to be a digital delay. I kick it on at the start of the song and all is well. It's off for the middle of the song, and I kick it back on at the end. When I turn it on again, the light goes on and the screen shows the correct preset, but it completely kills all audio from my guitar. I have to then quickly switch off the entire effects loop of my Mesa Mark 4 to get audio back, and the only way the effects loop is usable again is to unplug the M9 and plug it back in. It appears to only be this patch. Any thoughts? Thank you!