Tony,
The answer to your question is yes.
The bulb and/or socket have a ground contact that is too small for the application. The condition is aggrivated by a contact point that is too loose as well.
Solution: Replace the bulb irregardless, but check the contact on the socket as well. If there is any indication of overheating, have the dealer replace both the bulb and socket, both sides, under warranty. Then, go to the IPD web site and get a hold of the glass-base replacement bulbs, and install the new ones with a bit of Vaseline or dielectric grease, and the problem is gone forever.
I'm an engineer, so I might get a bit carried away, but problems like this never occur more than once with me.
Just an aside, but the original Lexus LS-400 had exactly the same problem, but theirs was so bad that the lamps melted the tail lamp assembly as well.
Regards,
Mike Harris in Sandy Eggo
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