About the recent save file roll-back situation

We have recieved some feedback about save file roll-back situation these days,and we paid much attention on it.After checking the latest two versions we found out no modification about save files in recent updates.We think the reason for the recent roll-back situation is related to steam cloud save or internet connection,such as cloud save upload failure or local save file been replaced by cloud save file etc.. We'll keep finding the reason for this situation and fix it ASAP.Before that happens, please back up your save files and exit game normally, try not to restart or shutdown your computer abnormally,and keep your internet connection smoothly.