A couple of ways to try to minimise this problem,
1. Turn off global opening or at least reduce it to just the drivers window(it will still close all windows and roof on the keyfob)
2. Fit front wind deflectors, they seem to reduce the force with which the rain hits the door window bottom seal and therefore how much moisture gets into the inside of the door electrics.
One last thing, take your key out of pockets as I find it very easy to accidentality operate the buttons on the keyfob without my knowledge and come out to an open car.
PS, VAG Group are still taking to 5th when it comes to admitting there is even a fault let alone offering a fix for it, especially as the Alhambra is soon to be discontinued.