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I got an answer from Meraki Support:"We have re-created this issue in a lab environment, It appears that the Apple TV NIC tries to negotiate a half-duplex switch mode in sleep mode.I can confirm that Cisco Meraki is currently speaking to Apple regard...
Can confirm that I have the same issue on my MS120-48LP running MS 10.45.I have 7 AppleTV 4k connected and all of the switchports reports very high amount of CRC-errors as soon as the AppleTV is not in use.
I have experienced this exact problem before in WCS 7 a couple of years back and we are not the only ones it seems: https://supportforums.cisco.com/thread/2040769 I now run NCS 1.1 and this problem is still not resolved, all the walls in my drawn map...
