For the past couple of weeks I have been having the about problem quite frequently. I believe its a router issue as any other devices connected to the router have the same problems. Not all sites are affected, MSN Messenger, Youtube seem to work fine, Google search suffers with the above problems along with many other sites. The only way around the problem at the minute is to reboot the router. I am using a DGN2000, it was on Official Firmware, but I have installed DGTeam to see if it helps it and it hasn't. I am with BeThere by the way.