MC60 Module SIM Not inserted

We are using MC60 module in our Vehicle Tracking Product. After few days working Device start to show “SIM NOT INSERTED” and stops detecting SIM card. New SIM insert working for few days, again it is showing “SIM NOT INSERTED”.
Please help us to identify issue.

Check your hardware circuit, the sim card is not inserted, indicating that the module did not detect the sim card.

And this phenomenon occurs after several days of module work, it is very likely that the circuit is damaged in these days