We are left to fend for ourselves on intermittent problems such as these. Are you using Gen 2 hubs? I have found the Gen 2 setup considerably more reliable and worth the upgrade. Since getting the various devices hooked up to their respective hubs back in June I have had the hub go offline once which I attributed to my router needing a reboot as some other non-orbit devices mysteriously went offline. Routers handling lots and lots of devices can be problematic. I feel reasonably certain that the hub assignments have remained in place since there is no way that the devices I have could reach other than the closest hub and they work reliably. I could never say that about my Gen 1 setup which was always having problems with devices going offline.