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Hmm, I haven't encountered this on this map, although my computer is extremely (highlighted, underlined) prone to this kind of issue. In previous large maps by this author, this problem sometimes occurred.
The issue here is: due to a developer error, on large maps, the save file size exceeds (often) 30 MB (I might be wrong, this isn't my information), and the developers didn't account for this, meaning the game stops loading such large save files. This is the cause of all the problems.
How to fix it: most likely, there's no way. It might be possible, but I don't know.
Advice: on maps larger than "large," save more frequently. Also, it's just a scenario, so anything could happen.