That makes sense. I suspect that the "cause" in this case was the chrome extension that I had been using (I don't remember the name offhand, but it's the one th

That makes sense. I suspect that the "cause" in this case was the chrome extension that I had been using (I don't remember the name offhand, but it's the one that shows changes in HN between visits). I usually left the tab open but only visited a couple of times a day, so it may have been doing something like that.