I was having this issue with the bpm deviating on serato dj 1.7.2 with a Pioneer DDJ SX Controller. - I have finally found the solution for the captioned issue with my controller's pitch slider. I sprayed a bit of CRC QD Contact Cleaner into the slider and let it sit for a minute - then switched on the controller and the variable Bpm stopped. It now works as good as new.

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