I think I know why the error only happens to Limewire 4.8.1 , It because it promises more faster downloads and more chances then when you download the song it downloads then limewire freezes then when you check your song it says connecting then says waiting in busy line .

Well it happens to me , If anyone has difficulties with LW 4.8.1 just use an earlier version .
Anyway LW 4.2.6 was a bit faster and the computer froze less.