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most likely the bulb

It's most likely the bulb. I would try switching them around from one side to the other to see if the problem persists. If the problem moves with the bulbs it's probably a bulb issue. Otherwise the ballast might be getting weaker. The igniter is a non-issue in your case, as long as it starts the igniter is doing it's job.

Hopefully your car is under warranty, if not you're looking at a pretty penny for OEM bulbs. Might want to consider aftermarket D2S bulbs.

Good luck.
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