The monitor on my 2011 Hyundai Tucson doesn't work!

What is your question?

On days that are really hot it will come on. But other than that, the monitor is just blank or has lines across the screen. All the features work properly, I am just unable to set them without a visual.

What makes this problem better or worse?

Cold weather

How long has your 2011 Hyundai Tucson had this problem?

1 year and a half.