You can find details for voice commands on Bell.ca for your new remote and box as for finding your favories check out this page. To find all information to support your new device you can find here
In the past when i had this issue i simply took my phone that i was using to setup with to an area where the signal is not as strong and it would use the 2.4 vs the 5. It worked for me. You can also try logging into the modem and turn off Whole Home ...