Sorry you are having trouble.
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I scanned the channels and all 13 came in with very strong signals. The lowest was probably 70% based on the TV signal strength indicator!
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That sounds good; at least you got it working for a while.
It could be a connection or the preamp. You will need to make a part-by-part substitution with known good parts even if it means you end up with a completely separate system. If you think that is a lot of trouble, it couldn't be any worse than what is happening now.
I know you are anxious to get it working, but please slow down and do it right the first time.