I found the ESP8266 rock stable - been running for around 2 weeks so far. No issues.
The issue above also seems to be fixed - been about 24 hours now, no crashes, no odd values.
Update: Just done a update to Domoticz and now the value is incorrect and seems to be stuck there.
Sensor debug:
0
LPG:0ppm CO:0ppm SMOKE:0ppm
send: 1-1-0-0 s=0,c=1,t=37,pt=2,l=2,sg=0,st=ok:0
Controller log:
subtype = Voltcraft CO-20
CO2 = 536870912 ppm
Quality = Bad
2015-11-08 21:29:09.177 (ESP8266 Gateway) Air Quality (Air Quality1)
This is the 2nd time its happened right after a domoticz update (I'm running the dev build)
Could this be a issue with domoticz? Its weird how it only does it now after a update. To fix it however I need to reset the sensor.