I have several TP-Link Smart Plugs including HS105, HS103, HS103V2 and EP10. They all worked perfectly with my Netgear R6250 Router. I recently replaced the router with an Xfinity xFi Advanced Router, Model No. XB8. After resetting all the plugs and  disabling the 5GHz and 6GHz bands, I successfully connected my HS103V2 and EP10 plugs, but my HS105 and HS103 plugs failed to connect. Thoughts?