DDJ-RX sudden BPM changes

Hi,

 I bought DDJ-RX and having it for 2 weeks now. I use MacBook Pro with El Capitan OS with a lot of power and memory to run.

While track is being played especially near the end of the track, BPM or pitch will either go high or low pitched and messes the transition to the next track. Definitely Rekordbox DJ at this state cannot be played on live gigs when this happens. It's annoying because it happens at least every 10 tracks played.

I also own DDJ WeGo3 and use djay Pro as the software. Also the audio quality of Rekordbox DJ vs. djay Pro is subpar in comparison, using either DDJ Wego3 and DDJ-RX. Rekordbox DJ seem to sound like you are hearing it from a tunnel. Neither softwares nor the controllers were run simultaneously, to add as a note. The BPM changes happen in both controllers. I tried mapping DDJ-RX for day Pro but it's just too complicated and lights do not work either.

I believe there are other who has the same experiences. Can somebody from Pioneer DJ help with this?