Why is my script self deleting?

So this is absolutely bizarre. I have used Adobe Story without issue for over two years, but suddenly the script I've been working on has been deleting itself in massive chunks, with the data seemingly going nowhere. When I logged in it showed I had 32 written pages when I had done over 50. Believing this to be a simple error on the loading page, I went and checked, and sure enough about 15 pages were missing. I logged out and back in, but the script then said it only had 15 pages, and when I checked it had deleted over half the script I had just seen. This is beyond frustrating as a lot of work went into those pages, and I don't have a backup. To rule out the obvious I have not shared this project file with anyone, so only I can edit. Does anyone know a way to get this back, or gone through something similar?