need help with iPhone5S and MT 6.10 please

Hey guys. Total noob to MT AP functionality so please have patience. Running v6.1 on RB133 with Atheros AR5413. I have tried several configurations all with the same result. All devices ( iPhones 3-5, iPad 2-4, Apple MacBook Pro, Roku 1-2, Vizio TV’s ) connect and work. However over time the connectivity seems to slow and gets flakey. I find in the log that the 1 iPhone5S that I have seems to cause a problem. I believe it has something to do when the phone goes to sleep. The log fills with sent deauth messages until I wake the phone so I end up turning off WiFi on the phone. The attached file shows the log messages. Wlan1_vlan101 use a security profile with wpa2_psk with aes ccm and wlan1_vlan303 uses the default security profile. I don’t know what else to offer to help so ask away and hopefully we can solve this.

Thanks
log.txt (10.3 KB)

Surely someone must be curious or have some ideas or questions. Please help.