Chosen Solution
I notice often that downloads take a very long time. As I look at the Airport icon, it shows the message “looking for networks” very often. Is this an Airport Extreme Card or antenna issue? Update Well, I wouldn’t say solved, just changed. I am not sure how to mark it accepted, but I will cancel this and post another question, now that the symptoms have changed Update OK I have run diagnostics on the network activities. First of all the router is fine. Other devices (older MacBook, Iphone) work just fine in networking, and using the wireless router. As I monitor Network Status diagnostics Wi-fi, Wi-fi-settings, and Network Settings remain green constantly. ISP, Internet, and server go red intermittently, not all at one time ISP may turn red and the others follow. When red, I have internet/mail communication issues, when green, all is well. I have only had this computer a little over a year, but foolishly did not get the extended service :(. Any ideas? Update As I have been writing this answer, I have not seen any changes in the network status, and communication is great
WIthout knowing more about your router, distance from the router, broadcast channel and strength, other wireless devices which can all to varying degrees be a culprit in the problem it would be hard to venture a guess. If this answer was helpful please remember to return and mark it Accepted.