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Logic Analyzer randomly freezes...

I am using the STM32F4 Discovery board (Cortex M4F) with uVision.
I find the Logic Analyzer very useful, but I experience the following problem.
After a random time (10, 20, even 30 seconds) of correct working, LA freezes,
with the error message :

"Cannot access memory"

The only way to make it work again is to close and restart uVison, AND power
cycle the board. Just closing and restarting uVision is not enough.

As this is quite annoying, I am wondering if there is a way to prevent this,
and, in a subordinate way, if it is possible to re-enable LA without the need to
power-cycle the board.

Thanks

-Fred

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