MSP430G2553 PWM glitch when adc is on

Hi, I got a problem with a MSP430G2553. I got a PCB with the smt version and I reproduced the bug on the launchpad. I read the errata and there is nothing about this issue so i'm considering a bug in my firmware. First, I will explain the bug showing a screen shot of it. Then, I will show you the code that generate the error.

Basically, I wanted to use 2 timers (timer0 and timer1) and 5 channel ADC. When I turn on all of these, the PWM that goes on P2.2 from the timer 1 is not what I expect. Alone,  the timer runs smoothly at 50Hz as set. With the ADC or with the second timer, everything is ok.

Here's a picture since I can't explain it well.

Sometimes, the PWM stops and sometimes it stay high.

Here's a simplified version of the code I use on IAR. I tested it and it does the same glitch on the pin output. I don't understand why it does this. I initialize the modules and let it runs idle in a while(1); at the end.

#include <io430.h>
#include "types.h" //defines UInt8, UInt16, etc..

static UInt16 TSRV_LastMeasure;
static UInt32 TSRV_Timestamp;

//Init values
UInt16 ADC[5];  // Array to hold ADC values

/// <summary>
/// Main entry point of the software.
/// </summary>
int main(void)
{
  WDTCTL = WDTPW + WDTHOLD;
 
 //Initialize MCU speed to 16MHz
 BCSCTL1 = CALBC1_16MHZ;                      // Set range
 DCOCTL = CALDCO_16MHZ;                       // Set DCO step
 BCSCTL2 |= DIVS_3;                           // SMCLK to 2MHz
   
 
 //setup 50Hz timer
 UInt16 timerPeriod = 40000;                   //50Hz = (2Mhz)/40000
 P2DIR |= BIT2;                                // P2.2 output
 P2OUT &= ~BIT2;
 P2SEL |= BIT2;                                // P2.2 TA options
 
 TA1CCR0 = timerPeriod-1;                      // PWM Period
 TA1CCTL1 = OUTMOD_7;                          // CCR1 reset/set
 TA1CCR1 = 0;                                  // CCR1 initialized to 0
 TA1CTL = TASSEL_2 + MC_1 + ID_0 ;             // SMCLK, up mode, divider by 1

 //Setup ADC
 ADC10CTL1 = CONSEQ_1 + ADC10SSEL_3 + INCH_4;
 ADC10CTL0 = ADC10SHT_3 + MSC + ADC10ON;
 ADC10DTC1 = 5;                          
 ADC10AE0 |= BIT0+BIT1+BIT2+BIT3+BIT4;
 ADC10SA = (short)&ADC[0];
 ADC10CTL0 |= ENC + ADC10SC;
 
 //Setup time service
 TSRV_LastMeasure=0x0000;
 TSRV_Timestamp=0x0000;
 TA0CCR0 = 0xFFFF;
 TA0CTL=TASSEL_2+ID_1+MC_1+TAIE; // SMCLK + Divide by 2 + Continuous mode + Enables timer interrupt.
 TA0CCTL0 = CCIE;                              // CCR0 interrupt enabled
 
 __bis_SR_register(GIE);
 
 while(ADC10CTL1 & BUSY);
 ADC10SA = (short)&ADC[0];
 ADC10CTL0 |= ENC + ADC10SC+ ADC10ON;
 
 TA1CCR1 = 4096;
 
 while(1);
}

/// <summary>
/// Timer A1 interruption vector.
/// </summary>
#pragma vector=TIMER0_A0_VECTOR
__interrupt void Timer_A0_TA0IV_ISR(void)
{
 switch(__even_in_range(TA0IV,14))
 {
  case 0x0E: // Timer overflow.
   TSRV_Timestamp+=~TSRV_LastMeasure; // Adds the remaining difference.
   TSRV_LastMeasure=0x0000;
   break;
 }
}

Since I do not have a weird configuration, I think you may help me with this problem I got.

Thanks a lot!