When I got my DDJ-SB2 back from my friend and plugged it in. I saw that the tempo slider on the left panel was on 0 but the song itself on Serato DJ Lite was on +3,20 or something. I checked if the sync button was on, it wasn't. I tried moving the slider nothing happened. Only when the tempo slider is almost at the bottom it stands on +0.00. When I move it from the top down it goes from -8 to -2 and when the slider snaps at the middle it goes back to -8/-7 when it should be at zero?
I don't know if you guys know a software-wise solution?
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Try using a different USB cable or USB port just to check that the unit is getting adequate power from the computer. If that doesn't resolve it, you might try a MIDI monitor app to see if the slider is registering signal across the movement as it could be dirty contact or a failing component.
Serato DJ Lite doesn't have the ability to MIDI remap, so that wouldn't be the issue here.