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audio problems auto detect

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audio problems auto detect

Yesterday my audio suddenly stopped working on auto detect(dolby digital 5.1) and expert mode, only works on stereo now.  Swapped my cable box out today for a new one and tried the new coaxial and hdmi cable I was provided with but still have same problem.  Why would it suddenly stop working?  By the way, all the other tvs in the house are still working fine.