Hi,
As you say, very odd.
I don't think you need dhcp on the BT router. It's the first thing I turn off when a new one arrives (I have a Pi doing DHCP and DNS). On the latest one I changed the IP subnet and had to set a valid DHCP range, even though it was disabled.
Have you had any new white goods recently? Our Samsung fridge has a WiFi AP, enabled by default, and the signal it generated swamped my real WiFi in the kitchen. Took me a while to work out how to turn it off!
Simon
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