Hi Mike,
The most likely reason is that there is no solder joint--it just looks like
one. You did not say what the pin was made of, but from your description it may
be a non-solderable metal like BeCu. The Au-plating only acts to let liquid
solder cover [=wet in the surfactent sense], but not wet [=in the soldering
sense of forming a metalurgical bond by disolving some of the pin metal].
In addition, butt joints have never worked well, even when the pin/lead metal
is solderable.



Werner

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