Has the latest firmware been installed on the camera?
Has the latest camera driver been installed to the VMS?
Check that VMS network adapters have these settings:
Interrupt Moderation Rate: Extreme
Receive Buffers/Receive Descriptors: 2048
Transmit Buffers/Transmit Descriptors: 2048
Check that the VMS network adapter’s Link Speed is 1Gb/s.
Check that the entire link speed from the cameras to the VMS is 1Gb/s.
VMS should NEVER be connected to 100 Mb/s Link Speed.