Flashback Delay 2 randomly switching between loop and reverse
I have an option to buy used Flashback Delay 2, but it has a strange problem: when you set preset knob to loop or reverse, pedal sometimes automatically switches from loop to reverse or from reverse to loop. It happens only on these two presets. Now, the seller says knob probably needs some lubrication or some kind of maintenance work, but to me problem seems more on software level, because knob is still set to the selected position, just preset is switched.
Any ideas, suggestions?