@Carl_Anvell You have replaced single WiFi router with WiFi mesh. It is possible your philips android TV does not understand WiFi mesh. To verify: at the evening, before going to bed, power off all...

@Mioji General questions about Ethernet Backhaul feature on your Deco See Q4 in that document. Replace switch you have with TP-Link brand. I am also using TRENDnet TEG-S80g, works fine, too.

@Duat1972 Check if your Smart TV has Ethernet port, many do. If it does, connect it by Ethernet cable to the nearest M9, which is 30cm away, and configure TV to use Ethernet connection. I did that...

@joopie_17 There is a bug in Deco app speed test, in AP mode. To confirm you still have gigabit speed through M5 (and you do), connect laptop or desktop with Ethernet gigabit networking card to...

@B3cks I would recommend to setup Deco in Access Point mode. This is how I run my Deco mesh: two M9 Plus and two M5. In Access Point mode the router that you now have will keep managing home network,...

@Barton76 This should help in your situation: [Deco] Manual Signal Source Selection Note that you only need to upgrade your third, furthest Deco M5, with firmware from the link provided in above...