GSM Reset is connected to pin 4, and GSM On/Off is connected to pin 5, of the Arduino.
Shutting itself down? I have thought that it just goes crazy. How do you check power state. What AT commands. Or is it so that when there is no response to the AT command, the shield is down.Interesting ideas. Thanks.
Are those input 4 and input 5, they dont seem to be IC pin numbers.