I have a Linksys E4200 router, 3 xboxes (2 are wired and 1 wireless all experience this issue). I use my gamertag and my son's gamer tag on two differnt USB thumb drives so we can move around between the different Xboxes. What happens every three or four days is that we can no longer connect to xbox live but network connectivity is fine i.e. can connect to media center and PCs on the network. The xbox will take a long time to load (3 mintues) and then it doesn't connect to xbox live and fails the xbox live test as well. The weird thing is that is does happen to both gamer tags at the same time. Rebooting the router resolves the issue and everything connects again and very quickly. I have reset the network settings on all three xboxes but this hasn't helped resolve the issue.
I am unsure what would cause this to work great for 3 to 4 days and then all of a sudden (i.e. logging in and connecting to xbox live) I cannot connect and then add in the fact that it does not happen to all gamer tags at once. Once it does not work on one xbox it will not work on any of them so it is not specific to one xbox or the other. I'm thinking it has to be router related but I'm not sure where to look/test when it only happens every 3 or 4 days and is resolved with a router reboot.
Thank you for any help and guidance that can be provided.