Bell

https://support.bell.ca/fibe_tv/receivers/nova_remote.install_or_replace_your_wireless_transmitterTry adding one of these from Bell

I had similar problems which were reduced when a Tech installed  Wireless Transmitters ( VAP 3400) directto the Bell TV reciever...this seems to boost the signal to the Giga modem. There was no cost and I am sure they are happy not to hear from me......