I have had the player for more than a year and it crashed once, can't even remember how long ago. In the past I used the 2.18 version, currently I'm using the 2.20 version for half a year at least.Main reason I haven't upgraded to 22 is laziness.
Take note, I'm pretty much not using the video functionality, so I can't attest to the stability or lack thereof in the different firmware versions. It seemed to work fine with the 3-4 files I have tried.
Only other buggy behaviour I have noticed is that sometimes the artist name isn't being updated when the song changes,
haven't bothered to triangulate a more specific set of conditions, mostly because I don't care, I'm not looking at the player much.