Why do I loss audio on my sound system?

What is your question?

When the car is cold the sound system works fine. After the car warms up and I turn the heater on. It gets warm in the car the I loss the audio from the sound system. If I turn the heat off and it cools down in the car the audio comes back on. Sometimes i can tap on the dash and the audio will come back on, but it goes off and on. There is a popping sound coming from the speakers.