We spent around a hundred hours on this issue so my summary below in case it helps someone   symptom: users Teams call would randomly disconnect for 30 seconds, seemed worse for high density sites/areas issue/troubleshooting done: radius re-authentications using EAP-TLS are prolonged because the access-accept is significantly (~20-30s) delayed from AP to ISE. The network path was proven clean with packet captures on every single hop, so the issue had to happen from client to AP or on the AP itself. From our troubleshooting, it is not related to a specific family of drivers, AP models or even Meraki software version, although 29.x makes it much worse if you are using client balancing as it is active now (you could see idle clients during the middle of the night roaming every 5 minutes between APs with excellent signal strength). Rolling back to 28 and disabling client balancing helped, because the number of re-authentications dropped, but the original issue was still not completely gone and as the users became hyper sensitive to Teams drops, we could still see long authentications during occasional roaming events.   Unfortunately my experience with support was the same as everyone above so I decided to build a home lab with two MRs and actually managed to reproduce the issue consistently, using my home laptop in between as sniffer (I had a hard time explaining why I am running around the house with my corp laptop for hours trying to roam) After countless packet captures and research on mrncciew for us the issue was completely mitigated by turning off Radius CoA on the SSID. I even upgraded two regions back to 29.5.1 without issues for weeks now. Unfortunately I still don't have a clear picture why, I also gave up on chasing Meraki support to help me understand it. Although Meraki is awesome, these kind of complex issues really highlight the limitations of the product and the lack of meaningful communication/proactivity from support is making it much much worse. We will be moving back to Cisco Aironet in the future. summary: - 802.11r disabled - 802.11w disabled - rolled back to 28, better but still not prefect - client balancing disabled - Radius CoA disabled, issue free since, I can't even reproduce it anymore, previously I could trigger a Teams drop pretty much anytime I wanted with roaming. Now roaming is only a >1s short blip, even voice/video is uninterrupted - upgraded again to 29.5.1, still no issues     ... View more