The ports affected are the same set of ports each time.
None of the ports are part of an aggregation.
It happened to each of the ports 3 times in a 2hr period.
XOS version is 15.3.3.5
This was happening to 9 different ports which were attached to 3 different hosts, 3 ports per Host.
Host A - 1:3 mgmt, 2:26 iSCSI, 2:18 VM data (mulitple vlans)
Host B - 1:38 mgmt, 1:21 iSCSI, 2:8 VM data (multiple vlans)
Host C - 2:21 mgmt, 2:14 iSCSI, 1:12 VM data (multiple vlans)
2 of the host, Host A and Host B were affected enough that they needed to be rebooted. Host C for some reason did not show any signs of distress.
Here is the full log from the time frame: