CAN I BE PREWARNED AFTER TRACKS DRIFTING OUT OF TIME?

Your ears can do that for you almost instantly. ;)

@Pioneer, my ears certainly do detect a drift. what i want to know is, does rekordbox detect a track like this so i know about such a tune b4 i go to a club and play it. I can then choose to either delete track or be aware this particular track is gonna drift all over the place. I thought there was some kind of grid feature?

See my answer here: http://forums.pioneerdj.com/entries/81763359

The other thing you could do is warp your tracks in Ableton Live so they have a consistent 4/4 timing.

Hi. I have ableton and that;s what i used to do. Was hoping rekordbox could help me. 

If a track had a live drummer, the beat would wander but after warping it with Ableton, you'd have a regular beat interval meaning rekordbox would grid it accurately without needing to set multiple anchor points. It's probably easier to use Ableton Live first.

hi., as said i dont want to use ableton anymore, I am also not refering to live drum tracks, just dance tunes that drift....

I have a few tracks that have inconsistent BPM, cuts a bar a little short or just float around all over the place. My solution is to analyze the track in Rekordbox (sometimes the dynamic mode is better for these tracks) and then go through the whole song and adjust the beat grid on the first beat on every bar. It takes a while the first couple of times but after you get the hang of it it's not that bad. This will give you an accurate BPM reading on the CDJ (it will fluctuate but be correct) and, if you use the sync feature, it will work flawlessly with other connected players.

@nathan > As @Henrik says, you can do this manually but there is no way for the software to detect it automatically for you, you need to go through the track and edit the markers.

THank you Henrik and Pulse. I reckon I just do it old school and ride the pitch fader. I guess it will make me earn my money when djing hehe. My music collection is so rapidly changing as i love to keep the music fresh, that I do not put hot cues, or do any pre work besides adding tunes to rekordbox but thats just my approach to djing. 

@nathan > No worries. Again, if you spend the time editing your beat grid to have the markers in place across the track, even the most wandering of BPMs can be kept locked-in with the sync enabled.