2010 Prius Buzzing from Main Display

I'm hoping someone has run across this before. Several attempts at finding something similar online has been fruitless. We have a 2010 Prius with pretty much all the options (e.g. leather, moon roof, solar panel, etc.). It has been flawless and has required no major repairs. However, this issue has been an annoyance for a long time.

When starting the car, the main display (I don't know the name, but it's the one that shows speedometer) sometimes buzzes and the area where the gear indicator is, is dimmer than normal. It seems to be directly related to the headlights as sometimes turning them off will make the buzzing stop a second or two later. You can turn the headlights back on a few seconds later and it will either pick up again or remain silent.

However, occasionally it seems like if the car has been running for quite a while and you shut it off, then start it and the buzzing happens to start that time, then no amount of turning it on/off, turning headlights on/off, will cause it to stop. In these cases, letting it sit for quite a while (hour or more) and coming back, it will be back to the normal chance of it occurring.

The sound isn't a rattle. It sounds like electrical buzzing. The location sounds like it's coming from the main display. I haven't been able to track down a cause or even a likely place to start looking. I'm hoping someone here has run into this and can help. Thank you.

 

Okay. Thank you. I wasn't sure if it was something that someone could just put their finger on and say, oh, yea, it's this... happens all the time.