Not sure if this will help, but try disabling switch 1, which will switch from mixed mode (controlling turning and FWD/BACKWARDS with one stick) to independent mode, where you will need to use both sticks. I'm just grasping at straws here, but perhaps it has something to do with that. Also check to see what your Auto-Calibrate switch is set to, perhaps try turning it off. I own a Sabertooth 2X5 R/C but didn't have a problem anything like yours.