lost 4 hours but seeing all these comments here I’m glad it wasn’t more. Auto save symbol was going the whole time and manually saved as well. Game crashed and when I went back in none of my recent saves were there.

Xbox One

i played for hours, completing multiple quests, finding chests, synchronizing, etc. All the time the auto save was going in the bottom corner (I saw the symbol). I even manually saved once. And the game crashed. When I went to reload I had lost the last 4 hours and gone down 4 power levels, emptied no chests, no quests, etc.