Intermittent electrical accessory outages

About a month ago, while driving home, my 2005 Prius shut off the audio system. I was listening to an iPod through the CD/Aux setting that I had put in years ago.

The radio and CD player worked fine when I turned the audio back on, but not the. CD/Aux. Then, about 4 hours later, the CD/Aux came back on and works fine.

Yesterday, I had a similar.problem with the AC.

No other problems with the car. In fact, they are the only.problems I have ever had with the car. It is at 78k miles.