DDJ 1000 rekordbox

Hi 

I'm new to Rekordbox and to Pioneer ddj 1000, Ive installed it and updated the drivers but when i try to play tracks it is occasionally freezing and the track speeds can fluctuate goes a bit slow then speeds up. Has anyone experienced this? Can you offer any advise? I have a fairly high speck windows ten laptop and loads of memory etc. So it isnt that.