The output for the net nic CLI command contains a counter for LinkChangeTime.
LinkChangeTime represents the uptime, in seconds, when the NIC (network interface card) last changed state.
Typically, this may show a value between 8 and 10 seconds if there have been no state changes in the NICs since startup.
A much larger number may indicate that PacketShaper lost link temporarily or the NIC speed settings were changed. For example, an interface state change exactly 1 day after startup would result in a value 86400 seconds in the LinkChangeTime counter.