A common problem with the outside light fixtures is the socket itself or, most likely, the ground wire connection underneath the light fixture. At least on our 2003, the outside light sockets have a separate ground wire attached to the metal skin underneath with a screw. Removing the fixture and cleaning up the oxidation on these connections fixed the flaky behavior of both my outside lights. Use a little automotive bulb grease on the socket and connections to hopefully slow down any future oxidation.
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