Head light issue 2009

I just purchased a 2009 touring edition with 126k miles on it. I am really loving the mpg but noticed my head lights will start to flicker and then my passenger side will go out sometimes after a few minutes. I have been researching and have found it is a know problem but haven't seen too much on how to fix it. I did a search but could not find the best way to fix or diagnosis the problem. I take it it can be a problem with the ballast, cpu, or wiring of the car. Any help would be much appreciated!

Also the slide bar to change the brightness of the lights doesn't work and the lights are out on the display buttons but the screen itself still works. Is this a possible fuse issue?