I have problems with Linksys befw11s4 router. When I connect everything I can access internet but after some short period of time I get limited or no connectivity message from my network card and I am not able to access internet any more. Besides, I am unable to connect to router any more. When I shutdown computer and turn off route and then turn on everything on network connection is back but for the limited time. Do you know how to solve this problem?
This looks to me like your router is slowly dying. If you have access to some other router take it and connect it to your computer just to see how it works. If everything is working with some other router then you can safely assume that your router is malfunction and needs to be replaced.