Beatmasher pro- faulty fader?

hey guys,

I've noticed on my beatmasher pro that sometimes the vertical fader doesn't disengage correctly each time. Even though the fader is pushed to the top, the effect assigned at the time 'wobbles' a little. If this happens and I hold the fader at the top the effect will stop. Does this sound like a faulty fader? Or is the an adjustment i can make to the mapping which means the fader has to be slightly further down in order to start the effect?

Also another little gripe, my filter knob doesn't have a zero locater and my mates has . Not the end of the world I know, but annoying nether the less.