Arris Arris CM450: Tech support

There is some indication that a TW tech can put the Arris in bridge mode or that you can do it yourself by logging in immediately after resetting it to defaults:

www.dslreports.com/.../r27274883-TWC-Does-anyone-else-have-an-Arris-DG860a-modem-

Alternatively, see if TW will provide a modem only or buy your own (cheaper than leasing in long run and gives you more control). Failing that, assuming you can configure port forwarding, DMZ, etc. on the Arris, you have a couple options. First, with the
Arris connected to the WAN port of the N900, you could try putting the WAN IP of your N900 (this should be a private IP received from the Arris over DHCP) in the DMZ on the Arris (delete any other forwards on the Arris). Do all port forwarding and DHCP as
usual on the N900. Or, second, you should be able to use the N900 as just a switch + wireless access point (bypass NAT routing) by disabling DHCP on the N900 and connecting the Arris to a LAN port on the N900 rather than to the WAN port. All NAT, port forwarding,
and DHCP would then be provided by the Arris.

Personally, I would just get a modem only, such as the Motorola 6141 (if supported by TW).

I think your Arris Gateway is the bad guy here , some Arris and a few others don't seem to fully connect with xbox one....for some reason.... have the tech test you with a plain modem (no gateway ) and hook the xbox straight into it and test that way....

Arris TG1672G and Bright House Networks have by FAR had more problems with this than anybody and that Arris TG1672G even worse , one poster on here said the Brighthouse tech came out and gave him a new modem which fixed the problem , just by chance the
brighthouse tech also had an xbox doing the same thing and had replaced his own router just a few days before ....you could try and put that arris in bridge mode and see if it still persists but I would call your isp as they should be aware of this by now
...

The arris and the linksys are both router's , is the arris in "bridge mode" ?

Bright house and that arris gateway are notorious for these problems , one poster on another thread said the tech was even aware of it since the tech himself had an Xbox , came and replaced the equipment and instantly connected...