Reply to Fader issue within the software in need of assistance

Ok so ive had my S4 since christmas now and its been working perfectly. until now where the fader on deck a keeps going up and down like thisScreen shot 2011-02-13 at 4.57.05 PM 1.jpg not really sure why :S any assistance would be greatly appreciated or if anyone else is having/had this issue maybe we can help each other out.

Ive tried recalibrating and turning it on and off etc but to no avail