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My DSP board work some minute time late gone dead mode

 

  DSP type:TMS320F2808PZA

DSP working for a state after the sudden crash and can not return to normal working condition; The external crytal was found stop working at this time while power source are normal. This problem still happened after 

crytal replacement.  

   Using the TPS70151 external power supply;

     Why not wave the crystal will suddenly, without shocks? Why is this happening? I want to know you engineers have said that before the fault is? If there was how to     solve it?
    
Thanks.