So we've had this issue at both of our sites now for nearly 2 years. Meraki have been pretty useless at fixing the issue. Indeed it took forever for then to even acknowledge that this is a problem. We're running 28.5 and still no fix. We're moving one of our sites over to Aruba because it's become very sensitive in terms of performance and Meraki simply have no fix. Indeed they are obviously hoping that the depreciation of the affected AP's will bury the problem. We've been through every conceivable test, configuration change, update and the problem remains (AP's throttle WiFi down to about 20Mbs down 40-50Mbs up until rebooted, wired LAN tests are wirespeed.). We think you can force the issue by downloading a large amount of data 40-50GB but other than that it's appears to be quite random. I'm stuck with them on my other site for about another year but we will be swapping them out for Aruba. Meraki are in a bad place with this so do yourself a favour and start looking for your exit strategy.
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