Door lights on & off

Clk350, 07...W209. The doors courtesy lights work brightly... Then not at all... Then very dim.... Then bright again... Randomly. New battery last year. It's not my regular drive. Any help why? Thanks

Clk350, 07...W209. The doors courtesy lights work brightly... Then not at all... Then very dim.... Then bright again... Randomly. New battery last year. It's not my regular drive.
Any help why?
Thanks

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