My IST is no longer called. No further interrupts could be handled

I have a simple test-Environment:
A target with a running Windows Embedded Compact 2013 OS on a TI AM3359 CPU. To one GPIO-pin I have attached a frequence Generator to toggle this GPIO. No other SW is running on the target, only my small test application which subscribes for
notification on GPIO-pin Changes.
This Environment runs fine for some minutes (I got the correct notifications), but from some Point of time on, I did no longer get any notification from the GPIO-Change.
I have made a CELog from this Problem and could see, that at this Point of time the IST is no longer called, so the notification is no longer available and (because in the IST is normally done the re-activation from the Interrupt from
this pin) all futher GPIO-changes will no longer generate a Interrupt.
Has anyone a idea, why the kernel will not send me the Event to start the IST?
Additional info: The error is not systematic and occurs always not at a fix time in the LifeCycle from the target, but what always happens in the errorcase is that some µs (up to 8µs) after the GPIO-System-Interrupt is logged in CeLog a  SYSINTR_NOP.
Can this be the Problem? Could this be the reason for my not called IST?

Hi,
my BSP is from Phytec.
Is this problem new in Windows Embedded Compact 2013? I have worked for a long time with CE6 and have not seen this problem there.
Is this bug also available in Windows Embedded Compact 7?
Is it only available for ARM-CPU based systems?
Has anyone from you experience with this kinds of bugs and can tell me when MSFT will bring up a solution for this topic? If this topic could not be solved, we could not work with this operating system for our project.
Is there a official link (or post or statement) from MSFT available? You can not work with an operating System without Interrupts!
Thanks for you Information. Regards.
Markus

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