While driving my headlights turn off (one, main two, or sometimes ALL -including fog lights-). Switching them on and off a few times generally gets them to turn back on.
The Prius in the mid 2000s had a problem with headlights. There is a Toyota TSB on the fix. This may help a bit, but if you ask the Prius Forums you may get more details.
Could you link the TSB please?
I searched and couldn’t find it. Thank you!