Radio was playing fine while I was driving. Turned key off and left car parked for about 15 minutes. When I turned motor on the radio and clock were dead. Turned motor on and off a few times and still no power to radio and clock. Drove for about 10 - 15 minutes and again turned motor on and off. Still no radio or clock. After another few minutes I turned on the motor and radio and clock were working. Clock was about 30 minutes slow so the power to clock/radio had been off. Has anyone else experienced anything like this? Any serious advice would be appreciated.