Xbox Live! Loses Connection

[everton66]

I am on Blueyonder 10mb service. Apart from the desktop which is wired I have a lap top and Xbox connected wirelessly. I use a belkin Pre-N wireless router.

The laptop is fine. It never drops the wireless connection. However when my son switches on his Xbox and goes online with it to play against his mates after about an hour his Xbox loses connectivity - something to do with DNS. The only way to solve this is to reboot the router and the modem, after which normal service is resumed for a while. We can go through several reboots each night.

The problem doesnt seem to be the router or the modem, as I have no problems at all with the laptop. Only when the Xbox is on do I notice my own wireless signal strength has dropped but I still keep connectivity.

Question is why does the Xbox keep dropping it's connection? When he uses it not only is he playing a game over the connection but he is also using VOIP to talk to his mates he is playing against. Is it possible for him to be using so much bandwith that it just "runs out"? Having said that, wouldnt that also drop my lap top connection (which doesnt happen)? Or could it be the ISP is playing games with his connection? Or is it a setting on the Xbox (presumaby not given that it works until it crashes)?

Thanks,