I have a 2003 TT 1.8 convertible. I Had the car at the dealer the other day for an oil change.On the drive home, I went to put my window up and and the auto switch only goes half way up and get this the stereo turns off, then a few moments later my emergency brake beeps.I also tried the passenger window and it did the same thing, stopped halfway up. Once I got home i tried to replicate but no luck. But today I had the car out for a drive and made a right hand turn. As soon as I hit the right turn signal the radio turns off and on again. This made me remember that I did the exact same thing before I had the strange issue the other day. Anyone have any ideas?
Thanks
Chris

 

First I would check the main grounds terminal under the battery tray....prone to corrosion.