It sounds like this could be an over heating issue for the ballast.
If you can, swap the ballasts from one side to the other. If it starts happening on the other side, yes faulty ballast. If it stays on the same side then there is an over load from your factory harness or the HID bulb causing the ballast to overheat. It could be a bad bulb with a large amount of resistance causing the ballast to over heat.
I hope this helps.
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