Ok, some days playing with my Jaguarboard and now I can say it is now stable enough for everyday use.
The most important thing in my case is the kernel 3.16, if I change the kernel (for example 4.4 or 4.5 from sid or experimental repository), my JaguardBoard will freeze at any time, and the same applies to other distributions like Ubuntu, Mint, posibly because they use other kernels.
It goes four days running without any problem. I browsed the Internet, I edited documents (with LibreOffice), audio files (Audacity) and video (Openshot and FFdiaporama), I retouched photos (Gimp), I have also played 2D and 3D linux games (FrozenBubble, ChromiumBSU, FunnyBoat, Numpty Physics, Prince of Persia, Raincat, Secret Mario, SuperTux, etc...) , also games based on javascript (MathInvaders) and flash (Friv Games). The most difficult task for the JaguardBoard was to move html5 games based in raster images, a little slow but playable yet.
All tasks performed in a 32-bit system installed in the Jaguardboard mmc memory (PicarOS Linux).