For a few months the RS2 had an intermittant fault with the operation of the windows and sunroof particularly in hot weather.
Checked all fuses and relays etc all normal... however.
There is a "window controller" located under the steering column.
It looks like a large relay which you can take the outer casing off.
I found a dry joint on one of the internal relays.
All sorted now.
See below:
