As the guys above said:

Pull out the offending light and clean the contact pads very well with alcohol or other good cleaner, run solder in to any grooved or low areas and then hit it with a little emery cloth to knock off any solder "burn". Then drop a drop of solder on each contact on the socket itself and re-install. Had the same issue about 18 months ago, did this process and hasn't been back since.


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