I am a BT Fibre customer and my home wifi cuts out several times each day. When I was watching STV player on my TV, the wifi cut out quite a few times when no other devices at home were using wifi. The same issue occurs when I am in the middle of Microsoft Teams meetings, the wifi sometimes just disconnects from my laptop mid-meeting and I have to manually reconnect.
which hub version do you have?
have you tried using a wifi analyser on your phone and finding best/least congested channels and then manually select these channels in your hub?
Various possibilities:-
Automatic wifi channel selection is switched on & it's changing channels, if so use an analyser to find the least used channel(s). inSSider will work on a windows PC .
Smart setup is switched on which might do the same , if so switch it off.
Faulty device.
Also unless you have a SmartHub 2 then splitting the 2.4 & 5ghz SSID names is well worthwhile doing.