What does the display say when it comes up..? Each fader will display on the left screen as it is moved. That will tell you the faulty fader.
You can try cleaning the fader with some fader lube (this has been highly recommended for cleaning sliders and potentiometers, which you should NEVER use normal contact cleaner on: store.caig.com/s.nl/sc.2/category.293/.f ) to see if that clears it up. If that fails, you may need to contact your local Roland dealer to get it seen to by a professional.
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