I booted up the game today and found that my progress has gone back hours worth of saves. I was completing the challenges which it autosaves after each one, and I had done about 45 challenges whereas it is now at like 15. I also manually saved it before I switched it off. I can more or less guarantee that I didn't switch it off whilst it was saving too. 
 
Has anyone else had this problem? Or have any ideas as to what I should do? Because if not, fuck this game.