@Silentshooter there are a lot of performance issues being reported with the MR45/MR55 access points, most (although not all) of which seem to be resolved by turning off some of the power saving features on the clients. Here is a good example, https://community.meraki.com/t5/Wireless-LAN/Getting-low-connectivity-MR45-Meraki/td-p/98915. From what I've read and seen it seems to be problems with the chipset that is used in the MR45/MR55 access points. This is a first generation 802.11ax (note, its not Wifi 6) chipset and seems to have been beset with issues, and most likely why these access points had such a sort lifespan (the MR55 is already end of sale, has been for almost a year, the MR45 is end of sale in a month). The MR46/MR56 access points which are true Wifi 6 do not seem to have anywhere near as many issues and use a different chipset. I know its not the answer you want, but try the power saving settings on the client and try disabling 802.1x on the APs to see if either of these make a difference. I'd also try the stable release candidate and beta firmware versions, you can always roll them back from the dashboard if they create more issues in the first two weeks (after than you can still roll back, but need to contact support).
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