2007 Prius Headlights & Parking Lights not working (not HID)

Hi folks!

I have a 2007 Prius that had the headlights (not HID) go out o this summer. I bought replacement lights this summer from O'Reilly's and both of them have gone out after less than three months. I did not buy the cheapest bulbs either. I paid $37/bulb. They did not go out at the same time, but within a week of each other. I noticed when I was inspecting the lights that my parking lights did not work either. My brights were working, but then this evening on the way home I noticed that one of the high beams was not working.

I spent a lot of time researching online and just bit the bullet to take it to the dealer, because I couldn't figure out a problem. I had checked the fuses etc. I took it to the dealer and they said said not an electrical problem that they checked voltage and no markings that would indicate why they burned out. I would have paid the money for them to change it, horribly high as it was, but I had my appointment and had to pick up my car before they got around to it. On the way home I noticed that one of the high beams went out and it just feels like the succession of things going out there's more going on then four bulbs going out at all the same time.

Here is what I know:

• Hazards work
• Fuses are good (headlight, tail light etc. all the fuses are working)
• Tail lights work]
• Dealer says voltage is fine???