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Reset problem when using FIQ

Hi,
I have used SAM7X256 in my project, and FIQ (PA29) for external interrupt. sometimes while external interrupts source is generating pulses, uC resets! All of the initialization sub routines are executed again, but the FIQ does not work until another user or power-up reset.
unexpected resets are completely unpredictable. may be occurred in one minutes and sometimes after an hour.