I have had an AC-3100 set up as an aiMesh Router and an AC-88u set up as an aiMesh Node for about 6 months, working flawlessly; last weekthe AC-88u showed as Offline, rebotting both routers didn't fix the issue, I tried initializing the router, upgrading the firmware, downgrading the firmware, and upgrading again... but there is no longer any mention of aiMesh anywhere in the router... On the network map page, the space below the client list where the aiMesh button normally appears is blank )it's not even there if you inspect source), and on the administration page where you choose the router mode, there is no mention of aiMesh at all.