ciars

Common fault on the GT's - it was also a source of annoyance on my 147.

Do you use a pressure washer when washing your car? If so take it easy with it in and around lights.

You could open up the back of the indicator lense dry it out yourself and clean the seal before closing it all up.

If your still in warranty and dont mind the hassle, drop back to the dealer for a fix/replacement!