I installed new H7 bulb connectors this weekend as the ones that came with the car were somewhat loose. (Ebay item 320240991299 if you are interested). The most noticable thing was that the new connectors were VERY tight. I thought I might break something as I had to push so hard to get the connectors to snap onto the bulbs. I'm now wondering if this connection loosens up with every bulb change and has something to do with early bulb failure. Seems to me the bulbs lasted a lot longer when the car had less than 50,000 miles on it than they do now. Anyway, new bulbs too - so we will see how they do this time. They have been lasting about 3 months lately, so 6 months will mean something, and 1 year will be very unusual. Cross your fingers, and I'll keep you posted. I'll probably be doing our other Hyundai in a few weeks, so I'll have two test cases to observe.
Dan