My UN55JS8500 was muting and unmuting itself every couple minutes. I noticed the time/date was no longer in the upper right corner of the welcome screen (not connected to Internet). I had recently replaced my wifi router and forgot to update the network settings on the TV. This caused the TV to miss the last 2 system updates. The UN55JS8500 provided no warning message that it was no longer connected to the Internet. Solution: Update the network settings on your TV and force a system update.
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