I recently upgraded my shaw internet service and was given an Arris XB6 Advanced Wifi modem. My shaw I-comfort wifi, that was connected to the internet by my old shaw modem, stopped working. 

The thermostat will only connect to "B &G" bands or "B&G&N" bands. The arris XB6 has  A, G, N, and AC. The thermostat does not see the WIFI.

Is there anything that I can do to get them communicating? Is there a different internet 300 modem that works with the B band? I do not want to replace the thermostat.

Any help at all would be appreciated.