In case anyone else has this problem: I recently had an issue where the tempo button would flicker arrhythmically, as if the DN was having a heart attack. During such an episode the UI would also become non-responsive or extremely laggy. I’m not 100% sure what is going on, but it may have to do with sending too many MIDI messages to the unit. In order to solve the problem I needed to review my MIDI settings and configurations in my DAW and ensure that I wasn’t spamming messages to all channels, and to ensure that filtering was enabled.