The latest Volume release on the download page is dated October 28, 2014 with version number 1.5.
Reading some of the forum posts, it appears that there has been a newer release 1.51, that fixes some issues in version 1.5, but apparently it does not fix all the stability and playback problems. It is also not clear where to get this interim 1.51 release (from a link in a forum post).
What worries me, is the complete lack of communication from Volumio on what is happening with bringing out a new stable release.
Volumio started out as a great project with a pro-active develop team, but I am starting to doubt the commitment of the team to support the open-source version of Volumio. Judging from the blog post, it looks like the team is now working on the commercial Fizzly project.
I do understand that everybody has to earn some money and is entitled to make living, but I do think Michelangelo and his team need to state clearly what their commitment is to supporting Volumio. If they do not have the time to support it, please say so openly to allow users of Volumio to make an informed decision on whether they want to keep using Volumio and wait for stable releases or rather switch to a another music player.