Cable snr/agc

[radiomanok]

Cbs drama,and sometimes tlc channel, difficult to receive would freeze about every 15 seconds,yet other channels are good? Snr 78 / agc 80 could this lower snr agc cause this, you also get Pixelation on cbs drama.there is an in line booster on cable that virgin media put there,wondering if I brought another booster would it help.thanks

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