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even though the loop only executes once
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The attached image requests that the loop runs three times. (0>1 -> False, 1>1 -> False, and 2>1 -> True, so it will not schedule another execution.
I don't see anything that would explain the other symptoms you describe. My suggestion is to review it carefully and potentially even to isolate it by subsystem and identify what causes it to start failing.
Greg McKaskle