Sound bar quit working. Arc cable not working properly.

Sound bar quit working 2 days ago. At first we thought it was the cable provider. But then we confirmed it is not that because if I go from the box to the tV everything is fine. If I run the arc. Nothing. TV says no signal. I unplugged the arc cable in and out a few times and finally got video but no sound. Plugged and unplugged several more times. Now no video again. Don't understand what the issue could be as we changed nothing. Really frustrating being as this cost me 400 bucks is about a month old.

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