Hard fault in Reset_Handler()

We are seeing intermittent hard faults on our custom STM32F413 board when connected with ST-Link V2.

The hard fault happens in Reset_Handler() when FLASH contents are copied to SRAM.

Obviously this happens long before any of our code is executed.

Reset_Handler() is ST supplied code from MX Cube.

Other than this, our board works fine.

Any ideas?

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What type of hard fault?

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