While calibrating NF at: Calibration Method: "Scalar Noise method";
Receiver Characterization: "Use Power Meter"; DUT Connectors: APC 3.5 female; Ca kits: N4691-6009
Guided Cal 1st step: "Connect N4691-6009 to port1 and 2" Done
2nd step: "Connect Port1 to 2" PNA breaks down as attached screenshot.
PNA firmware: A10.65.01. this bug is repeatable by remote control.
If calibrating NF manually, PNA also collapsed sometimes as attached zip file.