Incorrect radio display on 2008 Hyundai Elantra

I have an intermittant problem with my radio. Whenever car sat with all the windows up in the sun whenever I started car it would show CD LOADING. If I hit the FM button display would change to FM1 LOADING. Eventually when car cooled down it would go back to the way it was supposed to. Radio and CD would work correctly it was just that LOADING display that was wrong. Any ideas?

Asked by for the 2008 Hyundai Elantra
I think the electronics in the radio are failing, and it's showing up when it's hot. It may not ever affect the way the unit plays.
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