Another Seal Failure with a Reusable Canning Lid

As I noted previously, I have had a higher seal failure rate with reusable lids than with single-use lids.  Also as noted, most of the failures have been slow to develop: the lid seals initially, then comes unsealed in storage days or months later. Ball, albeit with an unavoidable conflict of interest, points out that the vacuum strength can deteriorate 50% within a year.  That does match my experience. 

It has happened again.  I am no longer using reusable lids on new canning projects, but do still have some in storage.  A jar of peach preserves put up in July, 2016, was sealed from that time until sometime in the last month or so. I had checked it periodically and it was fine, but now it's not. Alas.