My left-front Xenon is randomly shutting down. Simply turning the lights on and off seems to reset it but occasionally it turns off again. Obviously it's not a fuse or it simply wouldn't work at all. Could it be the ballast? If so, how do I get a replacement? I've looked at (what I think is) the ballast, (aluminum rectangular casing), and it seems a simple plug-and-play switcharoo. But I can't find this part on Bavauto, IF it's the ballast. I have an OBDII scanner headed my way to identify the problem, but until then does anyone have any suggestions??