I left for vacation last Saturday and just turned my car on for the first time today after 8 days and all my radio favorites were reset... I was wondering how that happened? If anyone knows how that could possibly happen let me know

 

The only way I know that can happen is if the battery died.

 

I started the car back up and the battery wasn't dead and the car drove fine... I had both of my keys so there's no way anyone drove the car

 

Did you switch between key #1 and key#2... The settings will change if you are using the other key since it would be another memory setting.