Sentinels of the Multiverse crash

So I downloaded Sentinels of the Multiverse on my Kindle Fire. For the first few games, it played beautifully, if occasionally a little slow. Since then (and since I've bought the expansions), the game crashes out every turn or so. In the last few hours, it's gotten so bad I can't get a game started before it quits out.
I've tried turning off all animations, but it hasn't helped. Is this a known problem? Are there any solutions to get the game running consistently?
Best I can tell, I've got the 2nd edition 8.9" Fire HD
Kindle Fire HD 2nd Gen Specs
- Memory: 8GB Internal Flash Storage
- CPU: 1.2GHz Dual Core
- RAM: 1GB
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Sentinels of the Multiverse: Crashing a Monorail into Itself
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Images: Kammeran Gonzalez-Keola, Lindeboom Jean-Bapt, Kammeran Gonzalez-Keola, Kammeran Gonzalez-Keola