Maybe its all ports in car drop off line but you notice the inspect i/o because they are the only active ones at the time so you notice them change state. If you are truly loosing can communication to the car I believe that your door operator would log a com loss to controller, 2064 fault on door operator. I would approach this by trying to recreate the issue, pull p24 feed to cwil and see what faults it logs for example.
