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Audio not syncing with video

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Audio not syncing with video

I've had xfinity for barely a month and my audio doesn't sync with my video.  I've upgraded my HDMI cable from a suggestion I read on line, but the only thing that helps at all is to disconnect it for a few minutes and then everything is in sync for a couple of hours.  I have a six-month old LG tv.  How can I get this fixed permanently?