Frequently changing IP address of the EM7455 module?

I have an EM7455 module with Verizon SIM card. Its IP address changes very frequently on our system. Sometimes the dhcp client received IP Info (ifconfig, route) and the IP addresss info on Dyanamic APN list ( +CGCONTRDP) does not match.

What is the efficient way to monitor Dyanamic APN list? Do you recommend running CGCONTRDP continuously in background?

Is there a method to reduce the frequency of IP address changes?

is there any network detach?
you can monitor by setting AT+CGREG=1 and see if there is unsolicited message of +CGREG.
did you check the IP address of module by AT+CGPADDR=1 and see if it really changes IP address?