If this happens just with a few files .. then I'm sure the files are faulty. If you are after mainstream music, you may need to try a few times to get a decent copy.
If you are after fairly obscure botlegs , what you hear is often what you get
If you want to send me a PM ( button below this post) with further details I'll happily give you more thoughts as details of what you are downloading are not permitted on the forums themselves.
btw Another hobo is my alter ego used in times of technical difficulty