Hi @wkpatil,
It would be good to determine if it is the rangefinder that is stopping (maybe it needs a reply?) or whether it is the lua driver that is stopping for some reason.
If you don’t have a CAN inspector tool then the DroneCAN GUI tool may be useful although it won’t be able to show you the individual fields within a CAN message it will at least show you the messages are continuing to be sent.
If you can provide an onboard log we can also check the CANS message to see if CAN messages are arriving or not.