Wrong reading provided by ADC while using 2 ADC Channels

I was using an ADC channel ADC0.1 in lpC2468 for taking controller to power down, and it worked properly. Now I configured ADC channel 2 ADC0.2 for reading value from thermistor, as I load code into the controller the controller goes to power down just after reset after code loading.

if i comment init_adc_thermistor() i.e. ADC channel 2 initialization the system works properly,controller does not go to power down.

I am using both channels turn by turn, as shown in code in interrupt routine of channel1, i configure channel 2 and in interrupt routine of channel 2 i configure channel 1 of ADC

My code has following format

Void main()
{
   Init_peripherals();
   Init_Adc();
While(1){
//statements

                }

}
 ADC channel 1 initailized for power down 
void Init_Adc(void){
PINSEL1 |=0x00004000;
AD0CR = 0X0021ff01;
VICVectAddr18 = (unsigned)ADC_on_con_isr
VICIntEnable |= 0x00040000;
AD0INTEN = 0X00000001;
AD0CR |= 0X01000000;
}


 channel1 interupt routine 
void ADC_on_con_isr(void) __irq{
        int Dvalue;
        Dvalue =(AD0DR0 >> 6)& 0x3ff;
        AD0DR0 = 0X00000000;    //CLEAR ALL DATA
        AD0GDR=0X00000000;
             VICVectAddr = 0x00000000;
         init_adc_thermistor();ADC channel 2 initialized

        if(Dvalue<0x292){
        //power down
                                       }

                                           }


 ADC channel 2 initailized for  thermistor 
void init_adc_thermistor(void){
 PINSEL1 |=0x00010000;
AD0CR         = 0X00218002;
VICVectAddr18 = (unsigned)
VICIntEnable |= 0x00040000
AD0INTEN      = 0X00000002;
AD0CR        |= 0X01000000;
                                   }




 channel2 interupt routine 
void ADC_on_thermistor(void)__irq
{
int Dvalue1;
Dvalue1 =(AD0DR1 >> 6)& 0x3ff;
AD0DR1 = 0X00000000;
AD0GDR=0X00000000;
VICVectAddr = 0;
Init_Adc(); ADC channel 1 initialized
If(Dvalue1<0x170)
//printer off
}