I have a 2007 Series III and Fuse No29 (Radio 1 & Window Switches) 5A keeps failing.
The electric windows themselves always maintain power and operate when opening and closing the doors to drop and lift a little as they do to create that perfect air-tight seal with the hood, which they're famous for!
I can continue to use the Radio by just pressing the "On" button as though I'm turning it on without the ignition so it runs for an hour and then turns itself off until I press the power button again.
The only thing therefore that does not work is the electric window switches on the doors to lower / raise the windows until I replace the fuse and then they work for a while and the fuse blows again but not always immediately, sometimes it can be a few minutes or several hundred miles of driving before not goes.
My only thought was a poor connection / semi bare wire somewhere that is shorting but how to find it!
Any brilliant and ideally simple suggestions?