Personally, I was not aware of an "auto-sync" download from the Hub, although I grant you I very rarely use it. I prefer to take a "variable" out of the equation when I plan missions, and just plan them on the app itself and save it there. But as far as your question goes, when updating most any app, at times things can be changed or deleted without your knowledge. I am speaking of settings, etc...and that could include mission files as well. You can manually download the mission files from the hub and copy them to the tablet, if you have lost the "sync" ability for some reason.