APX 320 access points having a hard time connecting

Is anyone else experiencing this:  Randomly devices having a hbard time connecting to my APX 320 access point.  I find that I have to reboot them on a regular basis to maintain a consistent ability to connect to them.

I had a look at the logs the other day and they showed this : 

I don't know if it is related to the problem or not, but I thought I would share.

I manage the access points on the cloud at the moment, but i am thinking of moving them to the XG to see if it works better.

I have two SSID's setup.  I am only using 2.4G.

All 3 access points are setup like this :

Thanks In advance,

Terry