My headlights keep going out every couple months.

I have loved my 2005 Sorento from the day I drove it off the lot! Unfortunately, the headlights are just something I have learned to accept. I keep a spare package in my glove box because I know I'm going to need one soon, and it has kept me from getting fix-it tickets from police when they pull me over... I have found no good explanation for this phenomena, it just a Kia thing, I guess