Firmware working fine in debug mode but not in Release mode

Dear All, I have a problem where in my firmware is working in debug mode but it does not work in release mode. I am using LM3S3748 microcontroller target motherboard with Wavecomm GSM modem interfaced to it. The application is to receive SMS from the server and display it on LED Matrix board. I have used KEIL Compiler to develop the firmware. The program runs fine when it is running in debug mode of ULINK debugger i.e the GSM modem receive the SMS from the server and can be displayed on the LED board . But when I run target board is in release mode the GSM modem receives the SMS from the server but the microcontroller cannot receive the display data from the GSM modem. Raghu Nandan Ravi

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