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MSP-EXP432P401R: stuck in CPU_wfi() when debuging

Part Number: MSP-EXP432P401R

the version of Launchpad is MSP-EXP432P401R rev 2.1, the XDS110 of which uses MSP432E401Y as a chip for debug and download.

 recently I stuck in here at driverlib.c.

I used TI drivers to develop with noRTOS.

Why this thing happens?

BTW, in current case it happens when I2C_transfer(), but it is not a necessary factor. Also, when I pull out the USB wire and connected again, the first time would disappear the problem.