Also on the 5ghz settings under advanced you can enable the DFS bands to gain a few more channel possibilities maybe those will be less interference. Honestly there needs to be wireless consultation services in cities like Toronto, I would be interes...
Also remember, there is also 2.4 ghz interference from non-wifi devices, also it depends on the other routers broadcasting and what mode they are in and if your modem detects them or not. Remember if they can communicate with each other according to ...
Receive sensitivity is most important on the device and AP side as well. Many things go into this. Also try changing the location of the modem, try to have it as unobstructed as possible especially with metal objects close to it. Closer the worse.