c6300 wifi randomly dropping

I have a c6300 that has been pretty solid since installed in August.  In the last two week it has developed an issue where the wifi radios appear to randomly turn off (the 2g and 5g lights on the front of the router are out) and none of the three SSIDs that I have configured are visable/available (of course).  Any wired connection does not appear to be impacted by this so it doesn't appear to be a issue from the router out to the internet.  The only 'fix' for this is to reboot the router (not ideal) -- is there a more permanent way to address this issue?

I have tried moving the wifi channel to one that NetGenie indicates is "BEST" or "BETTER" but the issue will typically reoccur within an hour or two.