Wow! Long thread. Had very similar symptoms.   My problems started after noticing that one of our SSID had legacy WPA authentication configured. Changed it to WPA2/WPA3 but that forced users to reauthenticate and flooded the support desk. Word to the wise, always send a notice first...cuz users.   Anyways, I've put the settings back were they were and all came back as before, except for a few clients experiencing the occasional disconnect or not being able to connect with their cell phones.   However, I had forgotten to put back ONE settings that, at the time, I thought, hey, let's try that...   802.11w https://documentation.meraki.com/MR/WiFi_Basics_and_Best_Practices/802.11w_Management_Frame_Protection_MFP Had left it enabled. Disabled it and all my problematic clients reconnected fine. This thing is over 10 years old and does not seem to play well with others. So still on WPA and no 802.11w. I know...   Thank you. ... View more