My beloved GTi is struggling a bit getting it's drivers side headlight turned on! When the lights are turned on, all 4 fronts light up, but the drivers side xenon flickers on and off full brightness before turning off after about 10s. I have a suspicion it's the (rather expensive) ballast that's causing the problem, but wondered if anyone else has had a similar issue? My battery hasn't been overly happy recently, but given regular usage it seems to charge fine and the battery issues predate the light problem. Any help would be much appreciated!!