Same happened to my TimeFactor.
My solution:
Unscrew the base and you’ll see some screws holding a circuit board in place.
Remove them and carefully lift out the PCB (the whole back panel will also come with it as well).
Beware… do not try and lift it all the way out as there is a ribbon cable connecting it to another the circuit board below (that board you will see is covered in silver foil).
Disconnect the ribbon cable, it just wiggles out.
Be careful as there is not much leeway.
Once fully disconnected give the ribbon cable connectors a good blast of air to clear any dust/bits.
Now carefully, but firmly, reconnect the ribbon cable
Screw the PCB and base back in place.
Problem solved.
Should you need to replace the ribbon cable, then unscrew and remove the bottom (foil covered) circuit board off as well.
This could be more time consuming as it looks like you have to unscrew all the of the 11 knobs as well.
