Xfi won't properly reserve IP address for device; printers show as unconnected
I just switched from a third party router to the xfi gateway. I hate that there's no network map, that only MAC addresses rather than common language names show on the connected device list, and that I can't change host names in the edit dialogues, but I was allowed to change the LAN address to its previous state (192.168.0.x), and the gateway is working okay with two exceptions:
(1) I tried re-reserving at the same IP addresses the MAC addresses of devices that I previously reserved. Everything seems to be okay on that score except for one device, which keeps reverting to the same DHCP-assigned address. With my old router, it was at 192.168.0.6, but now it's always at 192.168.0.246, even after the assignment page tells me it has saved the new address. I have disconnected the device from the network and, after ten minutes or so, can tell the phone app to "forget this device," but it always comes back on at the same 192.168.0.246 address. My old router would allow me to disconnect and forget a device instantaneously, but this one doesn't seem to do that, and "forget this device" definitely doesn't work. (I note that others posting in this forum have had the same issue and there's been no solution posted other than to try "forget this device." There must be something we can do to make this a useful option.)
(2). My two printers definitely are connected to the network as I have been able to print off to them from my computer and can ping them, but the router interface, the Xfinity webpage, and the Xfinity app all show them as disconnected. How can I get them to be recognized as connected?