Sierra wp7608-1 modem is getting disconnected frequently from network

I am using sierra wp7608-1 in my project but it is getting disconnected from network very frequently . Network coverage is proper but still device is not getting IP from network . Please support to understand the root cause of this issue and what are the steps to follow to establish a smooth connection with mobile network .

Did you check the followings?


Btw, how do you establish data connection?