I just arrived here hoping for an answer but it gets more puzzling. I'm also seeing it on TP-Link Smart Plugs (HS105 and HS110) and on D-Link DCS-942LB cams, and on a ROKU Ultra streaming box - all attached to an ASUS RT-AC5300 with up-to-date 384.11_2 Merlin firmware, though it's been happening...