The average network bandwidth capacity of the specified network card is nearing the limit where it is saturating the network link. This value is taken over a specific number of background collections.
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If this is happening regularly, look at:

  • The NBT page of the Network drilldown to see if any users or other systems are copying an inordinate amount of data between systems.
  • Moving network applications or shared files to another machine to balance the load.
  • Upgrading the network subsystem to a faster technology.
  • Adding an additional network card to the machine and configuring the system to utilize it.