FYI, We're facing the exact same problem here as well. WLC code version: 8.5.151. As of now, only seen on the 3702i Access Points. In our case, clients either, take a ridiculously long time to associate, associate but unable to forward traffic (EAP authentication wasn't able to start; stuck at EAPOL Start stage as per packet capture), or associate and able to forward traffic, then dropout out of nowhere. This was all observed 5m line of sight of the Access Point in free space, so coverage isn't an issue here. DTXPOISON seen in AP logs, radios resetting themselves frequently for no reason.... unable to monitor it from central syslog servers as this is not considered as 'Error' level. TAC has been engaged.
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