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Fragrance and arunsharma0731 have mentioned some of the more commonly occurring issues, however there are numerous other possibilities.
Therefore, if you require specific advice concerning your design, I would recommend posting your code, configuration register settings and schematic of your design.
Maybe the PIC is being reset somehow. You need to describe more about the circuit.
Is the MCLR pin pulled high? You could connect a 0.1uF capacitor between MCLR and ground.
Beside that, without a look at the code - which is most likely the culprit - the only other guess could be that watch dog timer is resetting the PIC. In that case, disable watch dog timer or in the code, find out where you need to clear the watchdog timer so that you don't have this problem.
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