I got a Toyota Auris hybrid, about 5 years old. The headlights are flickering sometimes. I can not seem to connect it to a certain moment. I have encountered it when driving 80km/h on the engine, but also when driving ~20km/h on the batteries. Usually I spot it when driving on smooth roads, so I don't think it is caused by bumpy roads or loose connections.
It does not happen all the time, usually it performs regular, but sometimes it flickers for like 5 minutes, and then its fine again. It used to be only the right headlight but recently it is happening to both as well. Sometimes it's like driving with a stroboscope in front of my car.
I want to know if I could do something about it, I went to the garage already but they could not find a problem. I was thinking that maybe the battery is getting old and can not keep up with the demanded power usage of the car, and the headlights are the first to give in? Will replacing the battery fix this problem?