TC23X ADC Read Issue.

I am facing issue while reading ADC_output buffer in below code. TC233
with below code,
Sometimes i get correct output but sometimes 1 and 2 are observed instead of correct values.


while( (Adc_17_GetStartupCalStatus()) != E_OK);
Adc_StartGroupConversion(AdcConf_AdcGroup_AdcGroup _02_ms);
while( (Adc_17_GetChannelStatus(0U)) != E_OK);
ADC_ReadStat = (Std_ReturnType)Adc_17_GetGroupResult(AdcConf_AdcG roup_AdcGroup_02_ms,data_array_ptr);
while( (ADC_ReadStat) != E_OK);
Adc_StopGroupConversion(AdcConf_AdcGroup_AdcGroup_ 02_ms);

Please help me with this issue.

Thanks