Virgin Media Hub3 and Orbi

1400 sq feet over 2 floors 

we have quite thick walls so i never found a router whose wifi signal would reach from our kitchen upstairs - i have the router in the kitchen and the sattelite in the stairwell which enables the wifi (when available) to reach upstairs and cover the whole house

the issue i have is not reach, its the fact that the sattelite appears to regularly drop and then it seems to get in a muddle (ie the ssid is visible but either my devices connect and i cannot get intenet access, it says the wifi password is incorrect or just hange when trying to connect and i have to reboot the connecting device and try again)

i have unplugged the sattelite for now and the wifi seems a bit more stable but obviously slower from another room and signal doesnt make it upstairs anymore)

i have unplugged the sonos completely for now - just trying to get a stable orbi before i connect anything else

i thought downgrading to 2.0.1.4 would at least fix the sattelite dropping issue i had but it doesnt seem to have at all 

K