Tempo slider bpm on my sb3 jumps wildly

Hello 

while i was using my sb3 last night my right tempo slider started to act weird. When i move it down, the bpm jumps (decreasing) like 10 bpm (from 100 to 110 instantly, for example), and when i move up, it decreases too. That means i cannot increase the bpm on the song. When i load the same track on the other deck, it works normal.

When i bring the slider down (what should increase the BPM), it doesn't respond for some time, then it go back like 10 bpm and then starts to increase (but increase from the new value, so i cannot access the 10 bpm it jumped). Same happens when i move the slider upwards, bur inverted.

Thank you in advance