Haven't had much of a chance to investigate it properly my end recently. In an ideal world, I'd catch that packet loss with no other devices connected to the router but that's very inconvenient when I'm at home. I plan on unplugging everything when I'm not at home and seeing if I catch it then.
I've been out since 10 so far and the average ping has dropped right down on my BQM so there's certainly stuff on my LAN doing things when I'm not there.
You can probably see when transmission runs during the night.