Hi there,   We are experiencing a high volume of 802.11 Disassociation / Unknown Reason events across our wireless LAN. The issue is intermittent, and does not affect all clients at the same time.  The issue is evident across different SSIDs (we have 4 active), and importantly, is present at all of our 9 offices, separately located in several cities around the UK. Our clients are Windows laptops, iPhones, Andorid tablets, and customer mobile devices. Disassociations happen across all these different device types. Our event log at all sites is flooded with Disassociation events.   The pattern of the issue seems to hit one or more clients at a time, but is not restricted to a single AP, and does not affect all users connected to the same AP simultaniously or at others at the same site. When it occurs, the client only remains associated for a few seconds and then disassociates. This will persist for up to 15 minutes, and then the issue disappears. The user is not bouncing between APs when it happens, and is stationary at their desk. The user experience is high ping latency resulting in dropouts in network access.   We have been long-time Meraki users, and have recently switched support contracts to a new firm who have  replaced our old MR33 with MR44, and our MS120 with MS225, in exactly the same numbers and location . The only other change at that time was switching from PSK to Radius authentication (only on the Laptop SSID). We have reverted to PSK at a single site, however the issue persisted there after the change, so we believe authentication is not the root cause.   The support company has a ticket open with Meraki, who want a wireless packet capture from a single site as they belive it is interference related. We are in the process of obtaining this, however I feel that it is unlikely that the same interference issue would manifest at all of our sites simultaniously, and only since switching contracts to a new supplier.   Channels are set to Auto, Power is set to Auto. AP firmware is up to date.   On Meraki's advice, we have: disabled 802.11ax, removed L3 roaming. Meraki support have indicated there is no more they can do until they get a site-specific wireless packet capture. They have looked at our configuration and believe it is valid. We have (based upon threads found on this forum); tried switching from auto to manual channels (helps temporarily but the issue returns after 10-15 minutes), reducing channel width from 80 MHz to 20 MHz, updating network drivers on laptops (although the issue also affects mobile devices), reverting from Radius auth to PSK, auto updating channels (again, helps for few minutes but the issue always returns).   Any insight would be gratefully received, it is already a high profile problem for us and we have no clear direction on next steps to take to resolve the issue.   Thanks  ... View more