Removed and re-seated the micro — same symptoms.
Aref is 4.9V, seems stable. Same 4.9 at U4.
Same symptoms as when I was messing with the presets, altho I wasn’t able to reset all 6 presets (mentioned previously where all position of pot resulted in preset 6 writing or no preset writing).
Sweeping the pots doesn’t change anything.
Thanks,
Andrew