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Intermittent C6713B boot failure

Good afternoon

 

I am experiencing an intermittent boot problem with the C6713B DSP on a custom board

 

About 80% of the time the boards power on perfectly and have been left for 1+ hours and continued to twork without a problem.

 

However the other 20% of the time they do not boot (seemingly at all)  the pins are in the state determined by there IPD/IPU resistors and I cannot conect with an emulator.

 

A hardware reset puts the device into the state were it hasn't booted whether it had previously started correctlty or not.

 

Any ideas for me to investigate will be much appreciated as I cannot think of any causes that I haven't ruled out.

 

Many thanks

 

Sean