New SB7 will not connect to Epson WorkForce 630 printer scanner

Called Comcast out to service issues with dropped wifi signal.  Cust. service rep checks my connection remotely and says I have a problem outside.  My signal to the house is yellow.  Schedules a tech service call the next day.  Tech comes out and says there was no problem detected with your service, but I get the new SB7 router/modem, and he proceeds to install it.  I'm happy, this seems to give me better signal, no wifi disconnects until I try and print.  The service merry go round starts... Call Comcast with my issue, they say everything is fine on their end and to contact Epson. they're even nice enough to provide the phone number.  Call Epson and we try about 20 things and nothing works.  Epson say s the printer is designed to work only on 2.4 ghz.  The problem is with Comcast.  The printer gives me a print out telling me everything is good except "Detailed IP Setup Check" Status Unknown.  "*A router/access point channel conflict has been detected. "  Comcast solution?  Go back to the SB6.  Any fix I can try before going back to the SB6?