Try refining the WiFi settings ...
Log in to the Hub.
Advanced Settings > Wireless Signal > click ‘Disable Channel Optimization’ > Click ‘Apply Changes’.
Advanced Settings > Wireless > Security > Add 2 to the 2.4GHz Channel name > Add 5 to the 5 GHz Channel name > Click ‘Apply Changes’
You can leave the passwords the same as they are.
Log out of the Hub.
You will need to reconnect all you WiFi devices some will want to connect to 5Ghz and some to 2.4GHz and some will connect to either.
2.4GHz is a stronger signal but slower than 5GHz so if you have problems on 5GHz change to 2.4GHz.
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BT Smart Hub 2 with 70Mbs Download,18Mbs Upload, 9.17ms Latency & 0.35ms Jitter.