It could be well be because the 2.4Ghz network and 5Ghz WiFi network are still meshed together, some devices don’t like it.
Log into the hub. 192.168.1.254 you will find the password on the back of the hub.
go to advanced settings, then wireless, move the toggle bar where it’s says separate bands to on. Click save (don’t forget that bit)
then go back “home” on the hub, click on smart set up and toggle the slider to off. Click save.
‘Hopefully that will fix your devices from dropping connection.
sorry but you are connecting to the home network and not BTWIFI/FON
do you have your devices set to select strongest signal between wifi and mobile data I have an S7edge and had to turn that feature off
If you haven't already done it make sure you turn off "smart setup" on the Smarthub.
See link how to do that.