Emerson Home Audio MS9920TT (w/ turntable)

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This system has been great! Purchased for the turntable and the many vinyls I still have. BUT! After "cutting out" 20 mins. into use, then 15 mins., then 10 mins.--the system won't stay on long enough to even get the CD door open! I have set and reset the "reset" button to no avail. Any ideas anyone? I don't want to trash the audio system, but I haven't been able to locate anyone to even look at it for repair. Please help.