System freezes on fast backspin

Twice now when mixing a couple tunes and back spinning one of them the software has froze up and stopped all music playing for about a minute. Heavily concerned about this I have a big make or break gig in london christmas eve and I dont want this happening there. Anyone experienced this or do the denon staff have any idea on what’s going on? It’s only happened a couple times out of the hundreds I’ve done in the last few weeks but the cause has been the same both times. Much appreciated.