Do you have more than one television? If yes, does it happen on all your televisions?
If yes, check all your connections between the antenna and the pre-amp. A little wind can play havoc with a loose connection.
If no, try rescanning for channels twice. And check the signal level on a station that is intermittent.
Post your TV Fool Report. If your signals are very strong you might not need a pre-amp. But there is no way to know until we see your report.
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