I have some M5424 series switches in Dell blade chassis. I have one that keeps logging "The last device change happened at: " every 15 minutes. I have not been able to figure out the reason for this. Has anyone else experienced this and if so, what corrected the issue?
that message reports that a device has logged in/out of the Name Server. Try frabriclog --show to see if any of the ports goes offline/online at those times.