USIC (SSC Slave) DMA Problem with Debugger Stop

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cross mob
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Dear Forum,
I have problems with the USIC.
I managed to configure the USIC as SSC slave and the DMA transfers the receive/transmit data.
So far so good, I get the right data.
But if I stop the program with a sw-debugger and let it run again, the data in the buffer gets moved 2 Bytes to the right. ( AA BB CC DD EE FF gets EE FF AA BB CC DD ).
I cannot flush the FIFO.
What am I doing wrong?

Best regards!
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