Just recently I was reading a router's web page about this. The router maker admitted to the but and had new router firmware. Check with Linksys for updated firmware.
When I turn on my ASUS notebook it disconnects the XBOX and the Blu ray player from the wireless connection. ( the blu ray and xbox aren't on at the same time)I have reset the modem and turned the router on and off several times. The router is a Linksys and the ASUS runs windows 7