Pioneer Cdj 2000 jog wheel.

just a quick one .i turned on my decks last night for a spin.i mixed a few tracks togther on each deck.Everything worked fine.Untill i went to mix again on deck 2.

i had no pitch bend in cdj mode no spin back and no scratching in vinyl mode.Everything eles is working 100%.

Any help or info to fix this issue would be great thanks