In the last several years Volvo has taken at least three actions on headlight bulbs.

1. They installed voltage dropping resistance in the wiring to increase the bulb life with just a small dimming affect. This was a "recall" type action.
2. They made light bulbs a warranty item, so except for your lost time and mileage, you should not be paying for these problems on a new car. Are you?
3. When they replace one lamp, they are supposed to replace its twin because they realized that they usually fail in pairs.