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TPS7A3001-EP: Can not get stable output

Part Number: TPS7A3001-EP


         I‘m trying to get -12v output by TPS7A3001 but my output is not stable. Some times it outputs -12V (much times it can keep less than 2 second)but some times it drops to -4V or lower from -12V and constantly changing.

My input is -13V from another voltage regulators(it's output is correct). 

This is my PCB layout,U17 is the TPS7A3001

Q:Is there any mistakes in my design?How can I slove it?

Thanks for your help。