Let's try this. Right now you have 36 blocks. Make a copy and delete the last 26 blocks so that you have only 10. Run it and see if you have the same issue. If so, cut out another 5 and another 2 and so on until to see if you can get the same effect with just oine or two blocks. If so, then start deleting as many items within the blocks as you can so that the structure and skipping remain in tact but you have a bar minimum/skeleton version to problem solve with. If you can get the "minimalist" version of your que file to produce the problem, I'll go over it in detail to find where the problem might be coming from. Does that make sense?