Voice and picture out of sync on antenna tv

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Voice and picture out of sync on antenna tv

Todd_R
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Sometimes on the local broadcasts (TV antenna connected to the Hopper) the voices will become way out of sync with the picture. Sometimes as bad as a 1 second delay. Other times it looses sound completely. 
If I channel up or down, then come back to the original channel, the problem is gone. 

Anyone know how to prevent this from happening?