We're seeing this as well unfortunately. The issue is definitely only present on Windows, and perhaps more specifically with Intel wireless cards. Macs, iOS devices and Chromebooks are not exhibiting the issue. This is happening on SSID's with 802.1x enabled with our own RADIUS servers. We're also seeing the devices unable to even see the SSID for a period of time. Updating the Intel driver has not changed anything and both Win 7 & 10 are exhibiting the issue. When this is happening, the AP logs "Client has left AP" numerous times every few seconds. Often times the event log will also show "XX events were not logged". Eventually the client can successfully connect, but the issue reoccurs eventually. I have case 02459630 open regarding this issue but haven't really gotten anywhere yet besides moving a few AP's to a test network. We'll likely need to roll back firmware very soon as the number of devices with the issue is growing.
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