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That sounds like some sort of edge deterioration prior to reaching the chipping stage.
I use mineral oil for short-term storage and Camelia oil for long-term storage.
As I mentioned originally, there is a possibility that the quality of the steel has something to do with the problem. Many of the blades we all have were manufactured before modern quality control evolved into what it is today.
I have razors from as far back as 1968 when I started collecting and they are in great shape. It's the edges that occasionally show signs of age. I guess that is why we have hones.
Thanks for all the thoughts on the matter.