Printer keeps dropping from time to time. XB7 router/modem.

My printer drops sporadically from WIFI.  Once I turn the printer off and on, it's fine for a little while but happens again later on.  It's not the printer.  The same thing happens at my girlfriends place and with a different printer.  The only commonality is that we both have Xfinity XB7's.  I read that the XB7 combines the 2.4 & 5 ghz signals so to speak, and the printers get confused and fall off.  I can't go in and specify one or the other because I have pods.  Ideas?