Hi,
its the EmonTxV3CM Continuous Monitoring firmware which it came with (this looks right when I boot it connected to a programmer). I haven’t changed it.
The ESP8266 is flashed with this: GitHub - openenergymonitor/EmonESP: ESP8266 WIFI serial to emoncms link
I’ll try connecting a laptop to it via the programmer and see if the problem occurs. It may take a few hours.
Thanks.