This is happening to me as well on my M13. I will have the scenes set up just how I want them and for no reason the settings will start moving by themselves. sometimes it moves a lot, sometimes it's just a little. It has happened to me on all 4 banks. It's indiscriminate to what effect is on but it is most horrible and noticeable on the delays or other FX that are timed. It has rendered my pedal un-trustable and un-useable for any live situation (or even just jamming on my own). I've gone back to my old pedal board and will likely never go back to a fully digital pedal like this; I just can't trust it. I've tried everything from cleaning the pots to reloading the system from flash memory to opening the unit looking for gremlins. Nothing I've done has gotten the ghost out of the machine. Sorry I don't have an answer as to what can be done to fix it. I'm pretty much just here to commiserate with you :/
