I have a grid box feeder setup for a single row with 12 pieces.
The pickup works fine. But once it has picked up the last item, it will just cycle back to the first pocket (which of course is empty now) - without stopping and asking for re-stock.
The manual says "If you run out of stock parts the system stops and asks for new material. You only need to place some new parts and confirm the message." but that doesn't seem to happen here.