BME680 BSEC Accuray output drops infrequently to 0

[mernst]

Using BME680 with the BSEC library on an ESP8266.

As expected it takes some time during startup when accuray is 0, then moves to 1. Exposure to clean outside air and aftwards breathing leads to 2 or 3.

As also explained in the forum, I can see switching between 3 and 2 indicating a new re-calibration happening.

However, as shown below, there are also instances where the accuracy indicator drops to 0, and without intervention becomes 3 again after some time.

Please see also the corresponding equivalent CO2 output:

As well as the IAQ output:

Any explanation of this issue?

Thank you

[mernst]

Hello, this is rather complicated, I obviously have the output not logged, so I will need to do this the next days.

[BSTRobin]

Since there has been no feedback for a long time, we close this question first. If there is an update in the future, you can still give feedback here.