For what its worth.... had the same issue here for years. Tp link eap 225 (2) giving regular hassle on ios devices. Tried everything but now bought a single unifi u6 lite and its been nothing but...

@JeremyHiggs @JSchnee21 Every now and then I experience the same on my 2 * EAP 225 (v.3, current latest 2.7.0 Firmware) with OC2000 setup I know most fingerpointing goes to apple for their wifi setup...