Thanks for the message. It’s happened a few times in the past but there seems to be no common thread to each occurance. It’s happened in both play and preset modes for example. Most recently it happened when I switched from digital to vintage delay type (it was fine in digital mode and I wasn’t even playing when I switched modes). I can’t really try the input jack as you suggested as I don’t know if or when the issue will occur again which makes the unit pretty much unusable with any confidence. Also I really don’t want to risk damaging my amp/speaker.