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Wi-fi Connected but no internet. Wired has internet.

I am a new client and received my modem yesterday. Fizz's router wi-fi has a lot of range but keeps losing connection to internet for the first 24 hours. Now it is not even connecting. Wired still has 130mbps/20mbps.
Default settings on wi-fi.
I have now spent two hours with a wifi-analyser app and selected other channels.
I decoupled 2.4G and 5G and set them to channel 4 and channel 48 because they were unused, neighbours are far.
Airtime fairness is disabled.
Band steering is disabled.
I also disabled wi-fi on other routers to make sure Fizz's router was the only one emitting.
What else can I try?
Is the unit defective?


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