Unexpected program reset in MPLAB while debugging | Piclist

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Hello all,
I had a strange issue while debugging in MPLAB. I am using PIC 16F73 with HiTECH C compiler.
The program counter unexpectedly resets to zero, at some point.The WDT is not enabled atall. Could you please tell me what can be the possible reason?

Please the part of code where it happened,
switch(DigitCount)
{
case 0:
TimePtr->Hour[1] = KeyPressCount - 1;
DigitCount++;
CommandWrite(0x06);
KeyPressCount = 0;
DigitMaxValue = 9;
break;

case 1:
TimePtr->Hour[0] = KeyPressCount - 1; //=> It happened here
DigitCount++;
CommandWrite(0x06);
KeyPressCount = 0;
DigitMaxValue = 5;
DataWrite(':');
CommandWrite(0x06);
break;

}
Thank you in advance.

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Unexpected program reset in MPLAB while debugging - peacezim2001 - Jul 15 8:56:59 2009