@ tp-link In case anyone else is following this -- I kept my TalkTalk router with wifi switched off and one cable into a newly purchased TP-Link Deco x20 (2-pack). This has solved every issue I had....

@TP-Link Just one addition - had issues on a phone on 5G communicating with my Home Assistant system that is on 2.4G that was solved it seems by making the SSIDs and passwords the same. So I will be...

@TP-Link Thank you. If I may provide more detail. Interference - From a Wi-Fi scan, I seem to have 2 neighbours on 2.4GHz - one with a lower power guest network -- so only 3 other routers showing....

@TP-Link As I am still having problems with this modem/router. Any chance for trading in for the TP-Link Deco x20 (3-pack) that should work better?

@TP-Link Following your advice - I have tried moving the scales and router next to each other. The Guest 2.4G wifi seems to need the main 2.4G wifi to be running so had to have both on. As always, my...

@TP-Link Thank you for tour interest. I did by the VR2800 secondhand for £70. I has had this issue since receiving although did take time to isolate as a modem issue after testing against 2x TalkTalk...