I have a program running in a couple of GT-863PY. It seems to work OK for a couple of days, and during these days the modules operate without problems.
Every each couple of days, if there's a RS232 communication error, the program resets the GT863PY and restarts everything (without problems).
When they have been rebooted some times, the GT863PY stops working and can't attach to the GPRS network... If I do a "AT+CPIN?" I get an "ERROR" message.
If I switch OFF and ON the GT863PY module (switching OFF & ON the power supply), it works OK for another few days....
Any clue of what may be happening?