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Lose JTAG connection after breakpoint

My application crashes after hitting a breakpoint 3 or 4 times, if allowed to run without breakpoints all seems well. Have tried this running my app on my board, my app on Keil eval board, and a Keil sample program on a Keil eval board. Also swapped several ULINKS. Same crash behavior for all sceanarious, they even crash at the same address in the startup code (0xb4)

After all this it seems like hardware is ok as it occurs across boards and ULINKS. I had been running fine for some months, perhpaps some issue with ULINK drivers on my PC?

Any thoughts?

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