With the MR56 we had very slow upload speeds which affected the clients poorly. Meraki identified an issue and fixed it with a custom firmware that is supposed to be released in beta 28.6. Do some speed tests on the internet with a connected client and see what your upload and download speeds are. IF you have slow uploads like I was getting 2.5Kbps then contact support and try the firmware. Reference case #05512885 for them to identify the firmware that was built.
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