82' 300TD - the dawg-gone driver's side tail light bulb burns out about once a year - seems each fall... no, really.

I've cleaned and tightened the socket... even treated it and the fresh bulb with dielectric grease last year; but here I am again - the bulb is once again burned out.

Might the light housing be possessed or something?

I've driven this car almost 5 years - never changed the bulb in the right side... but the left side needs a new bulb yearly. And each year I've checked the old bulb with an ohm meter - and yes, the bulbs are burning out...

Ideas?