One would think that this 100mbps issue would be looked into with more urgency because it has been going on for so long. We manage 5500+ Meraki AP's (MR46's and 9164's), and see this on a regular basis - mostly with the MR46's. Sometimes it is a cabling/keystone/switchport issue, but we have troubleshot this issue enough times to recognize when it is an AP problem. I can't wait for the fix either......