Watching this thread with interest since the same type of thing was happening to us:
http://www.chiefdelphi.com/forums/sh...d.php?t=134694
Moving to different PWM channels was the only permanent cure. Position 0 causes all kinds of activity in Disabled mode, Position 1 about half the activity. Positions 2 up have no issues.
Reminds me that we still need to get that RoboRIO off to have it looked at.