It occurred on Liu Bei and Cao Cao campagins, Three Kingdoms.
I save data as Liu1 and Liu2 and so on, and Cao1 and Cao2 and so on, to higher numbers as I play on.
I was playing the final missions(mission 5) of Liu Bei and Cao Cao, The Red Cliff. When I try to load some specific data, like the one named CAO5, it crashes or doesn’t respond. This symptom didn’t happen on previous missions. I am not sure, but it might be the specific problem of those final missions?
And for your information, when I saved these files, the cloud storage was more than full. Still, no problem was found. However, just in case, I deleted other files and had the storage sufficient. And the issue remains.
Anyhow, it is really frustrating. I am getting exhausted with various stability issues of this game. EVERY TIME, new problem appears.
BTW I even heard some ppl in South Korean community try to clear a mission on once becuz of this issue, but it seems I can’t do it like that 
Missions are hard and I really need to save a lot…