We are in the US, Montana.
I didn't see anything in the user manual or UI about it. It is random, I watched the switch all day on Friday (after clearing the error logs) and nothing, received a bunch of email notifications from my spiceworks server over the weekend and looked at the logs this morning and it had that count. I reset the log on that port again this morning and 3 hours later it is still at 0.
I'm scratching my head because of being random.