About a month ago, after 4 months of flawless operation, my Airport Extreme 6th generation base station - developed a strange problem: Although the tiny green "ON" light at the front of the unit remains green and steady when it's connected to the modem and is plugged in, and all the lights on my Motorola modem remain lit and steady as well....if I should happen to open Airport Utility on my MacBook Pro while connected wirelessly, I see that the green circle beside the Internet icon in the Airport Utility window will turn from green to yellow, for approximately 3 seconds, twice every minute. I've actually watched and timed it for 8 minutes at a stretch. So yes....green to yellow 16 times in 8 minutes. (Nothing like watching the grass grow in ones spare time, right ? ) If I connect the Extreme to my computer with ethernet cable - this occurs even more frequently/rapidly than twice a minute. The above has gone on all month. I've recycled both the modem and the Extreme...but that's had no effect. Fortunately - my actual internet connectivity appears to be unaffected except..... A couple of times the green circles in the Airport Utility window, beside both the "Extreme" icon and the "Express" icon (used as an Extender), turned to yellow triangles with black exclamation points. When that's happened I'm thrown offline and can do nothing - until the problem miraculously rights itself, after 1/2 hour or so. Has anyone experienced anything similar? I've worked with 2 Apple senior advisers; they're totally flummoxed. They're sending me a "replacement" unit which should arrive tomorrow. But I anticipate it will not be brand new - so would prefer to isolate the cause of this behaviour and keep my "new" Extreme. I'd love to hear any thoughts.....thanks ahead of time for any helpful input.