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MSP430F6659: issue with USB at low temperature

Part Number: MSP430F6659

Hi everybody, 

MSP430F6659IPZ    everything is ok  at room temp ,  when  the board is at -25 degrees  or lower   USB is not working   , I cannot connect .

I suspected  quartz  so I used for test an external clock  , same issue at low temp . 

please  any suggestion / test  I shoudl run ?  

any udea on what can be worng ?

best regards