I've encountered a similar issue although its complicated slightly by some changes within my organisation.    We had 20 Meraki AP's running perfectly happy across a large site. We've recently closed the site and kept two of the MR46's to use in our new much smaller office suite.    I've now setup the two MR46's with cabling direct to a Cisco Catalyst 9200 switch and they were running without issue for a couple of weeks and then on November 19th (i think) they started to complain about the link speed. I've checked the cabling, reset the AP's, forced the speed on the port. Nothing seemed to fix it.  I haven't been able to bounce the switch but I'll need to wait for an opportunity to do that. ... View more