question

The first potential issue I see is that there's an entry transfer in between Conveyor1 and Conveyor 3. I'm thinking that entry transfer should probably be at the other end of Conveyor1.

Looking at your model, on reset BasicFR1 closes all of hte separators output ports. Then randomly opens a port for a separator which then sends its container to a Queue and items to EntryTransfer741. Then their output is closed and waits for BasicFR1 to open their ports again to release the next set of items. Now with that understanding, looking at your code to pick a random output makes a little more sense.

In order to debug, I added the following code to line 33:

pf(time());pt(": ");pt(nodetopath(itemOfQueue, 1));pr();

The last entry it gives is:

839282.357539: MODEL:/Separator60

Looking at Separator60 you can see that there is a pallet sitting on it, but no gear boxes. If I continue to run the model, no gear boxes are ever added to Separator60. The pallet is stuck on the Separator because the Queue it's supposed to be sending the pallets (or containers) to has a max content of 1. Your AGV is never picking the pallet up. This appears to be because Rack47 has reached its max content of 2 because it can't send items out because its downstream object Videmoteur has reached its max content of 1000.

Basically your model has jammed up because all of your objects have reached their max contents and have no way of clearing out their contents.