Trouble in writing to Internal EEPROM- PIC16F684 - c

Question

In a Home security alarm system, we have a remote control armed with PT2440
with Fixed encoding (no hop coding, no encryption/decryption) and a central
receiver system armed with MCU: PIC16F684. I must use the internal EEPROM (256 bytes).
After a lot of programming and testing my problem reduced to: I can write to internal
memory before the main loop, but inside the main while loop, the write operation
failed. Here it is my main code
//This function Writes data to given address in internal EEPROM of PIC MCU
void internal_EEPROM_putc(unsigned char addr, unsigned char data)
{
unsigned char INTCON_SAVE;
EEADR = addr;
EEDATA = data;
EEPGD = 0; // 0 = Access data EEPROM memory
WREN = 1; // enable writes to internal EEPROM
INTCON_SAVE = 0x9B; // Save INTCON register contants
GIE = 0; // Disable interrupts, Next two lines SHOULD run without
// interrupts
EECON2=0x55;
EECON2=0xAA;
WR = 1; // begin write to internal EEPROM
INTCON = INTCON_SAVE; //Now we can safely enable interrupts if previously used
delay_cycles(1); // like NOP
while(!WR) // Wait till write operation complete
delay_cycles(1);
WREN=0; // Disable writes to EEPROM on write complete (EEIF flag on set PIR2 )
}
// This function reads data from address given in internal EEPROM of PIC
unsigned char internal_EEPROM_getc(unsigned char addr)
{
EEADR = addr;
EEPGD= 0; // 0 = Access data EEPROM memory
RD = 1; // EEPROM Read
return EEDATA; // return data
}
void main()
{
// IT WORKS!
internal_EEPROM_putc(0x12,0x34); //Write 0x34 to EEPROM address 0x12
delay_cycles(1);
c = internal_EEPROM_getc(0x12); // Read EEPROM address 0x12 in to variable C
if (c != 0x34) {
RC1 = ON; // activate a relay, if read and write mismatches
delay_ms(500);
RC1 = OFF;
} // there is no relay activation
while (TRUE) {
// IT DOESN'T WORK!
internal_EEPROM_putc(0x13,0x56); //Write 0x34 to EEPROM address 0x12
delay_cycles(1);
c = internal_EEPROM_getc(0x13); // Read EEPROM address 0x12 in to variable C
if (c != 0x56) {
RC1 = ON;
delay_ms(500);
RC1 = OFF;
} // no relay activation
}
}
Any thoughts?
FYI, I use C programming language (not assembly), I use CCS C compiler (PCWHD) (4.057)
under Windows 7 (32 and 64 bits) and my programmer is PICKKit 2).