nrf9160 network connection

Good day

I have a custom board using an nrf9160 device.  On the board I am running a variation of a lwm2m client.  I have a question regarding a network connection.  Why is it that sometimes the modem will not connect to the network without a hard reboot.  Is there any reason why this is happening and how do i mitigate it? I am using SDK version 2.5.0

Thank you !

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