program execution stops - dies.

Running code which has a repeating set of interrupt service routines for a timer and ADC. Program will execute for a minute or so and then freezes up or does not execute interrupts. Program toggles an output pin to show when interrupts are accessed.

MCU clock frequency is 5.6MHz. I reduced the MAX JTAG Clock down to 50KHz based on the following Keil support doc.

Also tried the other options listed in the above support doc.

System and hardware

uVision3 V3.05
jumper set to VCC/ext - correct.
ADuC7020 Eval Board

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