This is still an ongoing issue - See the thread on the subject at the URL below for all the details: https://community.meraki.com/t5/Wireless-LAN/MR46-MR55-WIFI-6-AP-s-disconnect-from-dashboard/m-p/149868#M20809. I'm running MR56 WAPs with 28.6.1 and they are unable to stay connected to the Meraki cloud for more than a few minutes a time. Going back to 27.7.1 is not a great option due to bugs fixed in 28 code.
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