This only happens (so far) while streaming Netflix. A message will appear saying I have been disconnected from Xbox Live. A screen then appears prompting me to Upgrade to Xbox live and I can switch profiles. Pressing the Guide button allows me to log right back in and then await another inevitable disconnect.
Recent changes: AT&T recently changed my cable modem to a new one. It is not listed on the network hardware list (last checked 9/10/13). It is a Pace 5031NV. After the install, the random disconnects began so I'm reasonably certain that this is the cause. I configured the modem firewall and choose Xbox as one of the options to always allow. The modem settings allow me to choose specific frequencies to allow but I am not well versed in these things and don't want to just mess with stuff.
Is there anything I can do fix this?