Recovery on Android is problematic, especially when it comes to phones that are not rooted, and the content is stored on the Internal Storage, but I think this is a problem of functionality rather than corruption. Use the file manager and try moving the recordings to another place then re-install the software.
Secondly, the phone update might also cause problems, because if you upgraded from 4.4.4. to 5.0, the application requires update as well to function properly. Go to Play Store, tap the bars on the left then My Apps and check for updates. Most likely you will have to update the software to work again.