Running Xubuntu and Exaile has been the most stable music player I've found. I've been running it for about two weeks now with little complication except the following:
A few times I had the suspicion that a rating I had set had been reset to the default 2 stars but I had always dismissed it figuring I had just rated some other song. However, after spending an hour or two updating my ratings (simply setting some at 3 stars instead of 2 and my top favorites at 4) I restarted to discover all the changes had been lost. Oddly a few of the ratings I had assigned a couple days after installing have remained. The ones that remained are a mix of mp3 and m4a as is the rest of my collection. Changes I have made to the artist or song names have been unchanged.
Needless to say I was kind of peeved at this waste of effort, however I was perplexed to find no information on people with similar bugs. Whether this is a legitimate bug or my own fault as a Linux newbie, I'd still be interested in learning the cause and hopefully finding a solution to it.