At the best of times wifi is a fickle beast that can be affected by numerous things such as distance from the Hub, building construction, other electronic devices, neighbouring WiFi, basically allsorts.
VM supply to the Hub, after the Hub it is up to you.
.............................................................................................
You may be as well refining your wifi management, it might not fix your problem but will certainly help keeping track of your wifi frequencies.
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.
*********************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************
BT Smart Hub 2 with 70Mbs Download,18Mbs Upload, 9.17ms Latency & 0.35ms Jitter.