Hello Andrew,
You are correct in noting that the ADC overflow is not tied to the IQ samples. We would need to do a bit of work to make that happen.
Right now, the ADC overflow flag is a boolean that is cleared once per call to GetIQ. Setting purge to true will not clear it right now.
Until we change the behavior of the API, it might be appropriate to ignore the ADC overflow flag when you want to purge IQ?
I apologize for the inconvenience. I will make a note of this issue and in the future maybe we can improve the reporting of the ADC overflow flag.
Regards,
Andrew