Factory low beam HID issue

[Zulu95]

Xenons should have their own ground up front. I doubt if the rears are your problem. I would swap bulbs across sides and see if problem travels with the bulb. If it persists on the original side then you have a ballast going out and you need to find a replacement. There is always a gamble buying parts online but at the cost savings we all do it. Sometimes we luck out and other times we are out of luck! There is just so much cheap far east junk out there it is hard to avoid.
GL
Z