Mine in the Superb are similar and appear to have a mind of their own - from the Superb manual, which I suspect is the same detail as the Octavia:
Motorway lights
If the automatic light control has been switched on and the vehicle speed is over 140 km/h for at least 10 seconds, the side lights and low beam are switched on automatically.
If the vehicle speed is below 65 km/h for at least 2 minutes, the lights are switched off.
All of this can of course conflict with the light sensor too.
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