Xdj -Rx2 Sync and Pitch Fader issue

Hi 

Normally i dont use sync option frequently when i play dance music, but i am playing long hours for lounge sets i am preparing to myself for afterwards. 

On RX2 when i press both decks on sync for example on 100 bpm it works well but after 2 or 3 song played the tempo fader doesnt respond at all and stays in same bpm. Nor synced nor synced off doesnt respond at all. of course i want to change bpm gradually on my sets i cant play 50 songs on same bpm right? When i try to off the sync buttons and change the tempo, suddenly tempo option going from +10 to wide option and when i use the tempo fader bpm chancing drastically 10-20 or more bpms etc. and music tempo changes drastically also.İf i use the tempo fader all the way down or up, it changes, but my recorded sets is ruin that way. İ am using Rx2 with macbook pro, not standalone mode with flash drive, but i also tried on standalone mode and the results are same. How can i fix this? Any İdea? İ try to push sync button with shift and other buttons, i try to change tempo from computer, but doesnt change anything. Thanks in advance.