05 tl hid??

I know there are a lot if posts and I have searched but found nothing on my particular experience. 05 tl and my right side low headlight stopped working. So I replaced the bulb and got it all together and it came right on. I later drove the car and turned the headlights on and it didn't come on. I turned them off and on several times and it finally came on. If it comes on it seems to stay on but it only works maybe 1 out of every 10 or so time I cycle them on. Ballast problem?

What is others experience with this and what is the best fix?