asset tracker v2 connot connect nrf-cloud

   hello,everyone!   I'm having a major problem with my nrf9160 dk board suddenly not connecting to the cloud.  I registered and renewed my certificate, but the result still failed to connect to the nrf-cloud. I don't know how to operate to solve it.  Please give me some help.  

   I would like to express my sincere thanks.

   yours

   jessie

   sdk:1.9.0               LTE:NB-IOT

   

  

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