"Jumps" in recorded mix

Hi everybody,

I am using my XDJ-RX2 for a year now and never had problems.

However lately after mixing and hearing the mix again there are "jumps" in my mix and I can't figure out where the problem is.

Basically in the mix music is playing and suddenly the track jumps forward in the same track and play another part for 5 seconds or so before jumping back to the other part again. While mixing nothing of this happened, everything sounded well and normal without jumps. I didn't even pushed any button in that moment.

So When this happened the first time when my brother mixed we ignored it. Then there were some more mixes that were normal, and suddenly the problem came back again and this time it stayed, my last 3 or 4 mixes have this problem. I recorded just with my XDJ-RX2 with my usb stick in port 2 as usual without any laptop or other device. If you want to hear the problem check out following link https://soundcloud.com/mimic_noise/nightout-vibes-volume-9 of my mix in soundcloud and fast forward to 17:30 min, at this point the song jumps forward for 1 second and jumps back again, the same happens later at 53:30 min.

So I hope you can help me with this, I don't know what to do because as I said I didn't do anything to cause it.