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Why does Vizio TV forgets channel tuning?

I have a Vizio 46″ LCD TV with a digital tuner. Our cable comes from the wall into the TV no box or adaptor is attached to it. It was working fine until a few weeks ago, not sure when it changed as we didn’t use it for a few weeks. Now when I turn it on to DTV I get the message “No Signal” on every channel that used to come in. If I rescan I get them back, but when I turn the TV off, the next time it’s turned on I get “No Signal” again. It seems to have started as soon as I noticed all channels were gone from the “TV” input (analog), but don’t know why that would affect the DTV input. Please help

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