I have a question about my radio. My car is a 1982 Datsun 280zx N/A. It has the digital radio display, but it doesn't work most of the time. However, I've noticed that if I've been driving the car for quite a while with the radio on, it will sometimes come on and work. It usually stays on until the car has been turned off for a while. Any idea what the problem could be?

There is an intermittent connection, possibly a crack in a trace. As the radio heats up from being on, it expands enough to make contact. As it cools, it contracts, and the contact is broken.