Keep an eye on your H.I.D's fellas. Especially if there the cheap ones, they get bloody hot!! I was wondering why my headlight was out...
Never ever had that problem before.... looks tasty. Have you had water sprayed in and around them? Cleaning the engine bay for example?
I haven't heard of this happening before on the 35w HID's either. They actually draw LESS current than your stock Helogine bulbs, being only 35w, and stock being 50w. Could have had previous damage before your ownership, and only now finally gave up... (just a possible scenario)
Im thinking water damage, next set i get (just ordered) i will be using some waterproofing silicon shit