2004 S80 Low Beam fails

[Jtardif]

My low beam bulb on the passenger side only does not last more than 3 months, sometimes it pops in as little as 1 month. When they blow all I have to do is replace the bulb and they work fine until the next one pops. I do not touch them during install. When you look at the back of the bulb you can see a slight discoloration between the two terminal posts that plug into the car. I have been going through low beams bulbs for a year now and I can