MSP430G2553: MSP430G2553 image/program erasing problem

Hi,

flashing /loading (image or program) into the micro controller its works for a small time (about 5 min to 10 min) and suddenly its stops functioning/operating.  to function again/to make the controller/system operation  i need to flash/or  program  the micro controller again but the problem is repeating.i am not understanding what is going wrong.

thanks in advance...