Game crashes when loading vault

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I seem to be experiencing a crash whenever I try to load my saved vault. I can get to the loading screen, and it spins for a while; but I always end up with a black screen and then the app closes.
I've tried removing the app from running in the background; and did a power off/on of my device but to no avail.
Is there any way around this; or am I stuck waiting for a patch?
Edit: I'm on an iPod Touch 5th Generation / iOS 8.3
Edit #2: As far as I can tell; this is sporadic. Sometimes it'll let me back in; other times not
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Images: Ron Lach, ANTONI SHKRABA, Nicola Barts, Nicola Barts