I highly doubt that this train could get transferred to NR, all state trains for so long have been operated by their respective regional zones. But certainly, bookings being stopped from NZM side first doesn't add up. Also, both sides bookings being stopped just one day apart also seems strange, for a train taking 40 hrs each side.
Could it be that some of the train's rakes are being made up north, like at ICF Kapurthala?