If you actually have the Zenith model TV (B25A24Z), the trouble is not in your set. This model has only an analog tuner, and what it sounds like you are describing is digital pixellation. This is what happens with a digital-to-analog converter box when it gets a weak signal, with rain fade or heavy snow on a satellite dish antenna, or when a digital cable system has some signal problems. The converter equipment locks the last complete frame (or breaks up into blocks and freezes) and the sound is muted.
You'll need to look for the cause of your trouble in whatever is feeding the TV. If you have a digital converter box for off-the-air broadcasts, make sure you have a good antenna and all the connections are tight. If you have satellite TV service or digital cable service, you might need to contact your service provider for help in troubleshooting and fixing the trouble.
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