After first using my Skydemon Mobile MD in flight I put it into 'sleep' mode and when I got home I was able to download my flight tracks.  When I later did a full 'power off' I was surprised to find that after powering back on the flight tracks had been deleted from the 'Statistics' menu.  Why is it set up to do that?  Isn't there a way of storing the tracks after powering off?  If I fly away for a weekend I'm going to want to power down my MD to save battery power, but I would also still like to be able to download the track file when I get home.  Can this be changed?

Also, what happens if the battery runs down completely?  Does it go into sleep mode or power off mode? ie will I lose the tracks if I forget to turn the unit off?