Anyone else encountered this - CDJ2000Nexus

Hi all, firstly merry christmas and best wishes for 2013 !!

I recorded a set yesterday on my now stable decks but started to notice a couple of hours in that some of the beat grids I'd set previously in RB 2.0.2 had moved slightly off beat ? I didn't cause too many issues but definitely the tracks had been analysed, cue points set and saved but definitely the beat grids had moved slightly.

Just wondered whether this had been encountered by anyone else ?

Cheers