@TP-Link Thank you for the fast response! The motorola is just a modem. IPTV/VLAN is Disabled.

I have 4 Deco routers. The main is a Deco W3600 with SSID: Deco_EB90. The main receives ethernet via ethernet cable from a Motorola modem. The ethernet cable is in the #1 port on the Deco. Wifi is...