Antivirus on, Wi-fi - https://testmy.net/db/sDCoGSJ1
Antivirus off, Wi-fi - https://testmy.net/db/hNukHCjT
Antivirus off, Ethernet - https://testmy.net/db/zJ9mdVty
Antivirus on, Ethernet - https://testmy.net/db/PUlHk7ug
It looks like it's a problem with AVG.