I tried testing the voltage on battery and alternator like you suggested but everything was good. I took the vehicle back to dealer and they said that my radio had an internal failure and needed to be replaced. I talked to them knowing that the radio is not covered under the CPO warranty and they were nice enough to take care of it for me anyway so I got a new radio.
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2004 BMW 530i
2008 BMW X3 3.0i
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