Lights on radio/cd player/clock work only intermittently

We just purchased a 2000 Quest with 123,000 miles and have found that the lights on the radio/cd/clock will not always be on when the radio is turned on and the clock, which is supposed to be on all the time only goes on occasionally. Once on the clock will not go off until the ignition switch is turned off. Is there a simple repair? If so, what is it? Thank you.

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