Vodafone India — postpaid internet pack

I have an issue with one of my gps tracking device that i can track the vehicle only from midnight 12 am to 4:59 am in the morning every day and i cannot track the vehicle from 5 am to 12 am. We are facing this problem from the first day of sim activation.

The sim, which we are using in the device is vodafone and it is post paid connection.

Please let me know, is this problem occurs due to the internet package of vodafone or any other technical issues?

Please suggest the solution for the above mentioned issue.