dont know why it worked but......

I searched for 2 weeks for a track and downloaded every version i got thru the search and every single one was corrupt and then I found a way round it.

Instead of searching for artist and track I just searched for the artist and then selected the track from the search results....got the track no problem and I have done this ever since and not had another single corrupt track.

Like I say, I've got no idea WHY it would work, but it did for me.... maybe worth a try?