The CO2 is estimated from VOC output (SIAQ), so it can not be used as an reference of CO2 concentration and it does not have accuracy.
I can understand that the CO2 values are estimated and they are not quiet accuracy. However, any other value is also wrong.
You can see an IAQ value around 130 but it suddenly starts to show values around 300, but the envoronmental conditions have not changed.
Can you provide some guideline on why the sensor suddenly starts to recalibrate if there has been no change in the environment?
We couldn't give comment on limited log data, since we do not know the actually test environment.
If you needed, you could provide the raw data to us, we can do simulation for them. The log data needs to be recorded in the format of attachment.