3 Month Old Sigma S2 Subwoofer Making Deep Distorted Sound

Hi guys, I have an S2 sub that is 3 moths old and it's making deep distorted booming sounds, almost as though it's blown, but we do not ever have the volume higher than normal listening volumes. It was working correctly, we shut the TV off and then back on to watch about 15 minutes later. No other changes. I tried restarting multiple times and unplugging to reset. Any help appreciated!

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