@freakazoid I don't have any links, unfortunately - this is entirely original armchair research so to say, running across too many unexplained things over the years that I can only really explain by rolling in these two factors as the explanation.

So it's certainly not a proven theory, just something that pops up Suspiciously Often as a thought, which for me is often a sign that there's something there (even if it isn't always exactly what I was expecting)