I2C Problem. Multiple Slaves hang

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#include <16F887.h>
#device adc=10
 
#fuses HS, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock=20000000)                //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)
#use i2c(SLAVE, SDA=PIN_C4, SCL=PIN_C3, address=0xA0) //FORCE_HW, stream=I2CS
 
#define LCD_ENABLE_PIN  PIN_D2                                    
#define LCD_RS_PIN      PIN_D0                                    
#define LCD_RW_PIN      PIN_D1                                    
#define LCD_DATA4       PIN_D4                                    
#define LCD_DATA5       PIN_D5                                    
#define LCD_DATA6       PIN_D6                                    
#define LCD_DATA7       PIN_D7
 
#include <lcd.c>
 
float temp = 0, old_val = 0;
int8 ctr = 0;
union float2bytes { 
    float fval; 
    int8  bytes[4]; 
} fvalue;
 
int8 data = '0';
 
BYTE addr, buffer[16]; 
 
#INT_SSP 
void ssp_interupt (){ 
   BYTE incoming, state; 
 
   state = i2c_isr_state(); 
        
   if(state < 0x80)                     //Master is sending data 
   { 
      incoming = i2c_read(); 
      if(state == 1)                    //First received byte is address 
         addr = incoming; 
    if(state == 2)                    //Second received byte is data 
        data = incoming;
       
    }
    //else if(state == 0x80){ 
      //i2c_read(); 
      //i2c_write('U');
    //}
    else if(state >= 0x80)                     //Master is requesting data 
    { 
      i2c_write(fvalue.bytes[ctr]);
      ctr++;
      if(ctr < 4)i2c_read();
      if(ctr==4){i2c_read(0); ctr = 0;}
      //i2c_write('M');
      
      
    } 
}
 
void main()
{
   int16 adc_val = 0;
   //set_tris_c(0xFF);
   setup_adc_ports(sAN0|VREF_VREF);
   setup_adc(ADC_CLOCK_DIV_2);
   setup_comparator(NC_NC_NC_NC);// This device COMP currently not supported by the PICWizard
   
   delay_ms(250);
   lcd_init();
   delay_ms(250);
   lcd_putc("\fSlave 1...\n");
   set_adc_channel(0); 
   delay_us(20);
   
   enable_interrupts(INT_SSP); 
   enable_interrupts(GLOBAL);
         
   while(TRUE)
   {
      adc_val = read_adc();
      delay_ms(20);
      temp = (float)(adc_val * 0.196078431372549);
      fvalue.fval = temp;
      if(old_val != temp){
         printf(lcd_putc, "\a%7.3f", temp);
         printf("Temperature is: %7.3f", temp);
         printf(" Degree Centigrade\r\n");
         printf("%7.3f\r\n", fvalue.fval);
         printf("%lu\r\n", adc_val);
      }
      if(data == 'K'){
         printf("%c\r\n", data);
         data = '\0';
      }
      //delay_ms(1000);
      old_val = temp;
      
              
   }
 
}