there aren't many "communist era" judges anymore, most are younger. The system is deep-rooted in communism though, because it was never reformed thoroughly. But these so-called reforms today are basically subjugating the whole justice system under the thumb of politicians. This will not solve the problem, but exascerbate it in time.
The solution would be to make the justice system more like in the US, but that's completely beyond reach for the likes of men who are politicians in Poland.