Any time I experienced bulbs burning out at a higher than normal frequency it was the result of corroded sockets. Sometimes corrected by scraping them clean with whatever will fit in there, other times just replaced the sockets. Sockets that had to be replaced looked everheated, likely caused by the poor contact causing arcing.
Clean the contacts on the socket where the bulb is inserted, and put some dielectric grease in the socket to keep moisture out.
2014 Overland, 3.6 L
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