Yeah, I should at least spray WD-40 into the connectors on a regular basis. It just gets hard to remember and I don't have it around a lot of times.

Perhaps when I get back to the US, I'll take all 3 or 4 of my bad supplies into apple and let them know that this is a reproducible problem, not just an isolated occurrence. It even happens on schedule every 10-11 months.
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~ John