clean the contacts (metel strips in slider) (i use servisol super 10) but aftershave works well. first blow out the loose dirt (air can and straw) and spray on contacts while sliding up and down. The best way would be to dismatle the deck but you should see results without.
Its the same with noisey faders/knobs and switches on mixers, dirt gets on the contacts and the level jumps up and down (like your pitch slider)
hope this helps
jim

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