QUECTEL EC200N-CN,NO CARRIER coming frequently

my module sending no carrier message very frequently, and on the basis of no carrier, my gsm module restarts, Is there any other possible solution to implement it? There are few question.

  1. why no carrier is coming frequently.
  2. once no carrier comes,is it important to restart GSM module.
    i do not want my gsm device to reset if no carrier is received, I want to wait for 5sec and check if this no carrier message is changed,if message is changed then do not restart gsm, if no carrier remains even after 5sec then restart gsm.