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Do you have any idea why I sometimes get CH-CH HD perfectly and then at other times not at all.
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That is the nature of digital reception. If the signal is good enough, it's perfect. If it's not good enough, reception fails. The transition zone is very narrow, perhaps 1-2 dB either in signal power or signal to noise ratio
If your reception when it's "good enough" is right near the edge of the digital cliff, it takes very little reduction in signal power or quality to kick you off that cliff. A small shift in atmospherics, a bit of extra interference, or anything of that sort will cause reception to fail.