Hello
Can someone please help

I have a 03 GTI 1.8t recently four times last month and
only @ night my electrical system acts up.headlights dim/when I turn headlight switch on wipers come on real slow etc, but the car starts right up and is drivable. When I disconnect battery for 3+ hours then reconnect everything works fine.
I called dealership and they said could be comfort control module

thanks in advance for any info.