I'm occasionally finding the same thing with certain songs. Most songs I can download just fine, but some more popular songs seem to have a pattern emerging that I never saw several months ago.

There will be 2 or 3 songs with identical titles and nearly identical file sizes with 89 sources, then 2 or 3 with 88, then 2 or 3 with 87, all the way down to files with 15 sources. After the 15, there is a list of single source files. The problem is, none of these, be it the 89 source files, the 15 source files, or the single source files, will ever download. They just say Connecting... and then permanently switch to Need More Sources. It's rather annoying.