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2011 Sierra Audio Randomly Switches to "aux input device"

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As the title suggests, my Sierra radio randomly switches back and forth between whatever I'm listening to (typically FM) to this "aux input device" message.  Is the issue from the USB or the 3.5mm jack?  I'm considering taking it to a stereo center and upgrade the stereo, but if I can fix this on my own I probably won't upgrade.  I did some research, and it sounds like it'd be around $500 for a decent unit installed and configured to use the steering wheel buttons.  I don't really use either the USB anymore or the 3.5mm jack, so I'd be OK with simply disconnecting them.  


I look forward to your suggestions.  Or, if upgrading the unit is easier to upgrade than I'm anticipating, I'd welcome any advice.  

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