i dont know much at all about my computer but i do know its not a space issue.
if its any help to anyone, files that display disk problem under status can be fully downloaded, it just takes a while. if you cancel a file when "disk problem" comes up, then select the file you are trying to download again and resume the download, it eventually downloads properly.

i dont have an answer to the problem, but hopefully this will help until an answer becomes apparent.