You may be as well refining your Wi-Fi management, it might not fix your problem but will certainly help keeping track of your Wi-Fi frequencies.
Instructions for Hub 3
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 Wi-Fi 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.