ADC on MSP430 stuck on either timer delay or cunable to take ADC unless I remove all timer and push button interrupt - timer

Question

I have used MSP430 to write a custom blinking code with adjustable frequency. I use an ADC to adjust the frequency but I have been having issues with the ADC portion of the code being stuck while I use it with timer 0 interrupts and a Port 1 interrupt. But if I remove them from the program the ADDC works fine. Could anyone help me point out my error or help me understand the mechanism with which I could have the ADC running again? Attached below is a portion of my code:
float updatealphaFreq(){
int af_update = 0;
if(p_count>0)
{
WDTCTL = WDTPW | WDTHOLD; // stop watchdog timer
BCSCTL1= CALBC1_1MHZ;
DCOCTL = CALDCO_1MHZ;
ADC12CTL0 = SHT0_2 + ADC12ON; // Set sampling time, turn on ADC12
ADC12CTL1 = SHP + SHS0; // Use sampling timer
ADC12IE = 0x01; // Enable interrupt
ADC12CTL0 |= ENC; // Conversion enabled
P6DIR &= ~0x01; // P6.0, i/p
P6SEL |= 0x01; // P6.0-ADC option select
P1DIR |= 0x01; // P1.0 output-LED
//lcdInit();// Initialize LCD
//lcdSetText("Select Frequency ", 0, 0);
//lcdClear();
while(1){
//__enable_interrupt();
ADC12CTL0 |= ADC12SC ;
//delayMS(1000);
//lcdSetText("Value of a_freq: ", 0, 0);
float i = 0;
af_update = ADC12MEM0/100;
i = af_update *0.325;
//lcdSetInt(i*100, 0,1);
//delay_ms(10000);
//lcdSetText(" ", 0, 1);
}
ADC12CTL0 &=~ENC;
ADC12CTL0 &=~(REFON + ADC12ON);
ADC12CTL0 =0;
}
p_count = 0;
while((P1IN & BIT3)!=BIT3);
return af_update;
}
#pragma vector=PORT1_VECTOR
__interrupt void Port_1(void)
{
switch (P1IFG & BUTTON) {
case BUTTON:
P1IFG = P1IFG & ~BUTTON;
// flip the LED output
P1OUT ^= LED1;
P1OUT ^= LED2;
break;
default:
break;
}
return;
}
//Timer ISR
#pragma vector = TIMER0_A0_VECTOR
__interrupt void Timer_A_CCR0_ISR(void)
{
OFCount++; //Increment Over-Flow Counter
}