Hi have gone to 192.168.1.1 and then home then Customise my Wireless
Network turned off 2.4 clicked save
then went to home network and wireless settings and checked that
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Try a factory default of the router's configuration. Log into the router & go to:-
Maintain > Device Management
You should find it there.
When reconfiguring, also make sure that Band Steering is unticked as well.
I suggested a factory default be tried before replacing the router if it is faulty.
I agree with @KeithFrench that reset is probably the best way forward. The fact that the WiFi remains on even when you believe you've turned it off could indicate there is a problem with the router. That is unless you missed something when turning the WiFi off.
If you want to try temporarily changing the SSID this is done within the WiFi settings on the router.
Once I know the results of the factory default, if the router looks faulty, I will get the OCEs to consider replacing it for you.