MSP430FR5949: The equipment field operation has a small probability, ADC12 conversion results over 4095, up to more than 50000

Part Number: MSP430FR5949
Other Parts Discussed in Thread: STRIKE

#define CALADC12_25V_30C  *((unsigned int *)0x1A22)   // Temperature Sensor Calibration-30 C
#define CALADC12_25V_85C  *((unsigned int *)0x1A24)  //See device datasheet for TLV table memory mapping


void ADC_ui(void)
{
  REFCTL0 |= REFTCOFF;//
  ADC12CTL3 &=~ ADC12TCMAP;
  ADC12CTL0 |=ADC12SHT0_2;
  ADC12MCTL0 = ADC12VRSEL_1+ADC12INCH_12; // ref+=AVcc, channel = A2
  ADC12MCTL1 = ADC12VRSEL_1+ADC12INCH_14; // ref+=AVcc, channel = A4
  ADC12MCTL2 = ADC12VRSEL_1+ADC12INCH_4+ADC12EOS;
  ADC12IER0 = 0x04;                      // Enable ADC12IFG.3
}

void ADC_all(void)
{
  All_over=1;
  REFCTL0 &=~ REFTCOFF;
  ADC12CTL0 |= ADC12SHT0_8;
  ADC12CTL3 |= ADC12TCMAP;
  ADC12MCTL0 = ADC12VRSEL_1+ADC12INCH_12;//  P3.0-A12 
  ADC12MCTL1 = ADC12VRSEL_1+ADC12INCH_14;//  P3.2-A14
  ADC12MCTL2 = ADC12VRSEL_1+ADC12INCH_4;//   P1.4-A4
  ADC12MCTL3 = ADC12VRSEL_1+ADC12INCH_2;//   P1.2-A2
  ADC12MCTL4 = ADC12VRSEL_1+ADC12INCH_30+ADC12EOS;//
  ADC12IER0 = 0x10;                       // Enable      
}


#define  TIME_SAMPLE  (u16)(round)(32768/(1000.0/20)-1) 

void ADC_init(void)
{    
  P1SEL1 |= BIT1+BIT2+BIT4; //ref+ BAT 
  P1SEL0 |= BIT1+BIT2+BIT4;
  
  P2SEL1 |= BIT4; //C+
  P2SEL0 |= BIT4;
  
  P3SEL1 |= (BIT0+BIT1+BIT2);//isk ilk vol
  P3SEL0 |= (BIT0+BIT1+BIT2);//
  
  while(REFCTL0 & REFGENBUSY);
  REFCTL0 = REFVSEL_2;// | REFON;
  //while(REFCTL0 & REFGENRDY);//Reference voltage output is ready to be used
  
  ADC12CTL0 &= ~ADC12ENC;
  ADC12CTL0 |= ADC12ON|ADC12MSC; //          // Turn on ADC12, set sampling time
  ADC12CTL1 |= ADC12SHP|ADC12SHS_1| ADC12CONSEQ_1; //CSTARTADD_0++                // Use sampling timer, single sequence
  //ADC12CTL2 |= ADC12RES_2|ADC12PWRMD;                 // 12-bit conversion results
  ADC_ui();
  ADC12CTL0 |= ADC12ENC;
  
  TA0CCR0 = TIME_SAMPLE;//20ms      // PWM Period
  TA0CCR1 = TIME_SAMPLE;//20ms;     // TACCR1 PWM Duty Cycle
  TA0CCTL1 = OUTMOD_3;              // TACCR1 set/reset
  TA0CTL = TASSEL__ACLK | MC__UP;   // ACLK, up mode     
}


#pragma vector=ADC12_VECTOR
__interrupt void ADC12_ISR(void)
{
  LPM3_EXIT;   
  Vol_RT   = ADC12MEM0; //vol
  Isk   =  ADC12MEM1;   //isk
  Ilk   =  ADC12MEM2;   //ilk
  u16 bat_ad = ADC12MEM3; //BAT
  u16 temp_ad  = ADC12MEM4;//TEMP
  if(All_over==1)
  {   
    All_over=2;     
    BATVAL= ((u32)bat_ad*8375/40950);//BATVAL 2.5/2*6.7*100
    //ChargeVAL =((u32)charge_ad*8375/40950);     
    temper = (s16)((((long)temp_ad - CALADC12_25V_30C) * (85 - 30)) /
                  (CALADC12_25V_85C - CALADC12_25V_30C) + 30.0f);
  }
  ADC_start();
  for(u8 i=0;i<=5;i++) {
    NOP();
  }
  SysF.TIMA=1;
  TA_task();
}

void ADC_start(void)
{ 
  ADC12CTL0 &=~ ADC12ENC;
  static u8 All_sample_last=0;
  if(All_sample_last!=All_sample)
  {
    All_sample_last=All_sample;
    if(All_sample==1)
    {
      All_sample=0;
      ADC_all(); //5 channels
    }
    else
    {
      ADC_ui(); //3 channels
    }
  }
  ADC12CTL0 |= ADC12ENC; 
}

During field operation, ADC conversion result is abnormal with small probability, exceeding 50000.

error condition:

   Vol_RT : 52188

   Ilk :21524

  temper:  60℃

These phenomena are beyond my understanding！But I couldn't replicate it when I debug it.