Bulbs could be burning out from high voltage. The voltage is controlled by the powertrain computer in response to need to charge the battery. If the battery is weak, it could be calling for excessive voltage to try to keep it charged.
You seem to be implying that it's the dealer's fault that the bulbs are blowing, yet you haven't said that any single bulb that blew either came from or was serviced by the dealer. It's four different lights, not one light going through four bulbs.
You can't blame the dealer for not anticipating that a bulb is going to blow. If he went around the car and changed all the bulbs that "might" blow you'd rightly accuse him of performing unneccessary services to pad the work order.
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light bulbs fusing
