Do you happen to be using any version two motors? We found a bizarre problem with our robot, where a particular version two motor on our robot would cause our servos to move as long as it was running.
FTC Team 6100 Chariots of Fire - Programmer (2012-2013)
FTC Team 7468 Blue Chariots of Fire - Programmer (2013-2014)
FTC Team 7468 Blue Chariots of Fire - Mentor (2014-2015)
Check out our team website at http://bluechariotsoffire.com/