Hey, on this particular screenshot I see that your downloading is only at 88.4%, it has to be 100% in order to save the signal. It should save that signal then for sure. Unless its some kind of a strange bug (I myself have saved that signal).
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I never tested what happens when all sattelites have 0 out of 4 packages (basically not functioning). I guess that when you have all satellites functioning it equals to 100% downloading speed. If you have zero satellites functioning it means 0% download speed. But these are just my speculations, I haven't tested that. But definitely maintaining all satellites is necessary as well as calibrating them with 'sd.calall' command