My car does the exact same thing except it keeps doing it untill it either cuts out or i have to boot it too keep it running.
I bet people think im a right idiot driving how i am just to keep it going.
Im leaving it now and its been stood for the last week.
I took it to the garage and for the two hours it was there it was fine and there was no problems at all, then five minutes later, same problem!!
its dangerous to drive as it keeps cutting out and im having to walk every where, which i havent done for over two years.