Phone calls interrupt my wired internet

I briefly searched but came up empty. This is not a wireless interference issue.

I have Xfinity preferred with gigabit speed and Xfinity voice. My modem has the router portion turned off and I am using a ASUS Rapture GT-AX11000 Tri-Band 10 Gigabit WiFi Router.

When I am playing my xBox hardwired to the router, if I get a call and if someone answers (person or answering machine), whenever they hang up the phone, my xbox game gets disconnected.

I have to quit the current game session (COD BO4) and start a new one. No reboots or anything required. It also affects my kids playing other online games on their computers wirelessly.

Has anyone else experienced this?