PRetty much subject says it all. Have a D-link Xtream N router. HAve had no problems with it other then I try to do something as simple as browse Ebay auctions. Its somewhat random but generally within about 5 to 10 minutes I lost my connection and after a couple of minutes its back online. I can have multiple connections playing WOW, Xbox Live, Playstation NEtwork, etc and not a problem other then ebay.
Don't know if it matters but I am running Windows 7 and using a realtek Wireless N network card. I never had this problem with my previous router it didn't start till I got this one.