Extender worked perfectly for 18 months.  Only problem I had was a few times after a power outage I would have to redo the 5 GHz settings where as the 2.4 would automatically restore.  The PROBLEM I am having NOW is the 5 GHz randomly looses host (5GHz light goes out on range extender and app states  I need to reslect host.  Reselecting does not work even though the Router settings have not changed and the 5 GHz is still being broadcast from router).   

For the first 18 months I had my router set to "automatic" for the channel - this TP-Link Extender no longer sees 5 Ghz at this setting.  If I change it to 36 or 40 or 44 it will instantly work perfectly for 2 to 3 days and then randomly dissappear again, changing the channel to 36, 40, or 44 instatnly fixes this, but only temporraily. 

Our router is an Apple Airport.   The 2.4 GHz network is totally stable and always works.  Please help stabalize our 5 Ghz.  TIA!!