"Authentication failed" - exceeding Airport Extreme's max users with less than 10 devices connected?

I am running an Airport Extreme with two Airport Expresses on my network.  There are two macbook pros, two iphones, two ipads, a PS3 and a chromecast in the household, a max of probably 5 or 6 of which are turned on at any given time.  Normally everything works perfectly, but occasionally my wife or I will get an "authentication failed" message while trying to log onto our home network, and after wasting time resetting the router, checking settings, etc, the only sure fire way to reconnect seems to be to make sure the chromecast and a couple of the iphones are turned off. 
If I remember correctly, the max number of connections to an airport extreme is 50?  Obviously not ideal but it shouldn't be refusing connections when 6 or 7 devices are trying to hook up.  We have had the same issue when firends come to visit.  I can't find any obvious problems in the airport setup, and I have my DHCP range set from xx.xx.xx.2 to 200. 
Any ideas?

is it the same device generating the error
i have had up to 40 devices on a single extreme maybe with 10 actively working others when needed with no issue

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