Hey there!

I had the same problem with my pitchfactor, with the changes occuring more and more often over time.

In my case, it was all due to a faulty connection of a ribbon cable inside the pedal, which wasn't under warranty anymore.

I took it upon myself to open up the stompbox, and to reconnect the ribbon cable. It's been two months now, and the pedal works perfectly. If you want more info, I took some pictures of the operation, and I could explain the whole thing in more details.

NB: I live in Europe, so it wasn't very practical for me to send the unit to the USA to have it repaired. But for American residents, the best solution might as well be to send it to Eventide.