intemittent

I've got a 2001 Leon Cupra 1.8T 20V. I seem to have a intemittent issue with stalling/cutting out all of a sudden. It did it on the way to work this morning so thought I'd post as soon as I got in. It has done it 3 or 4 times in the last week/10 days. Sometimes...and it is not that often...