These messages are logged whenever a link state change is detected on an interface. Thus, the link drops because the interface detected that the link has gone down. This is a physical layer issue.
Some possible causes:
- connected workstation is rebooting
- NIC incompatibility between connecting NIC and switchport
- bad NIC on connecting device
- bad cable
- cable run is too long
- bad port on switch
Try moving the cable to a different port and see if the behavior is the same. If so, then it's probably not a bad switchport. Also try swapping cables, checking the connecting device NIC (may need a driver upgrade), trying a known good device on the switchport in question to ensure the integrity of the port.
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