@steveits, Thanks for the links.
I haven't yet been able to look at the traffic graphs under 'status' under similar conditions. When the opportunity presents itself, I'll look again. FWIW, the program being updated was TurboTax.
It could be a bug, but unless I can repeat it, I hesitate to report it. Perhaps I'll just have to wait to the next release and keep my eye on it in the interim.