Danerad

Mine does exactly the same thing - discovered the problem whilst on tour and it was a nightmare for whammy style things - I'd release the pedal in the 'heel down' position and it would rise back up 1% or 3% or 5%, pulling the whole guitar out off tune with the song. I worked around it by assigning the whammy to a switch so I could turn it on and off but this really messed with my setup. i tried adjusting the tension but this doesn't seem like a hardware issue.