Hello, my friends and I have been playing the game for a few weeks now, but just today when I log into the game the only save file is from August 31st (I last played September 6th). My friends show having no saves whatsoever, and the shared world feature that we used doesn't seem to be operational at this time. I had saved both to the shared world as well as my own personal save, but neither show up. I have tried verifying the game files, logging in and out of Xbox Live, and Reinstalling the game to no avail. Is anyone else having/had a similar problem, or have a solution? Thanks in advance!

This same exact thing happend to me and my friend in our game. I had just played last night, and now when I boot up the game, it's someone elses game entirely saved in a different language. Not sure if it's the game itself or something on my end, but I hope it fixes itself soon. This'll be the third time i've had to restart on this game and i'm noooot really feeling a fourth.
I got no solution for you, but rest assured you are not the only one.

I am also going through this problem !