I just bought a Magnifi sound bar. Some speech is barely audible. How do I fix it?

I mostly watch football on TV. The sound is perfectly normal, but when the referee speaks on the field to explain a penalty, there is almost no sound. This has been consistently happening for several weeks. It also happens occasionally during commercials. For a few commercials, the voices will be inaudible, but the very next commercial will sound fine. Any suggestions?

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