Labview freezes, and stops responding each 10th run or so?

We have a fairly complicated labview program that most of the time runs normally, but once every 5th to 10th restart or so the program freezes so much that it cannot be stopped even by pressing the red stop button "abort execution", I have to use ctrl-alt-del to shut down the program. I heard something like this can occur if you have loops without time delay, so I included such in all loops.
The program is a forever loop of a stacked sequence 1-5, and the last thing that happens in one run is a button that finishes a loop in the 5th sequence. When I press this button is stays in the "on" position, and everything is stuck.
We run labview 8.2 on winXP, and the program is not compiled, but run in the development system.
Any ideas? Why does it only happen sometimes?
Ola

Here is one I just threw together. It is not neat and clean just a quick and dirty to show the basics. have a look and if you have any questions let me know
Joe.
"NOTHING IS EVER EASY"
Attachments:
statemachine.llb ‏80 KB

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