At times when the car starts with either the radio on or off there is no sound and it will not appear if the radio was off and then turned on or if the radio is turned off and on. It will often then appear the next time the car is used.
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2012 Lincoln MKZ Hybrid
Question: Why does the radio sound disappear at times?
SEE THE DEALER FOR WARRANTY ISSUE,IT SOUNDS LIKE AN INTERNAL PROBLEM