Hmmm, well you should check to see how large the .wav file is. For example I am using a song that is one minute eighteen seconds and is 1.5 MB's(does not play) while the .wav file is 13.2 MB's(plays but does not save such as in you case) . What I then think you can do is lower the quality of the song, maybe by re-recording it, but I don't know.
