skipping/ pausing etc

just playing back a couple projects and it has started skipping/ micro pausing/jerking in playback. Any suggestions. It seems kind of like a jumbled buffering issue.

Cubase AI5

Raise your audiocards buffer size.

I actually found the problem was really simple, and should have checked it first myself. My interface had become disconnected due to a bizarre coffee cup incident, and during this time the system driver defaulted. Reselected the Yamaha driver and all fixed.