Wouldn't worry about it unless a pattern develops.
There are quite a few "silent" settings inside the isp's setup, Windows, and browser options that the vast majority of naive or non-pro or power users are ever aware of. For the most part they generally chug away in the background and are never noticed, except by Admins that don't like anything they didn't say "yes" or "no" to taking place, even the 100% legit.
Keep and eye out, and if there's a trend keep a diary, if not, forget it as it doesn't seem to have caused any concerns and would be difficult to pinpoint without hands on the box. |