The crashes you guys are experiencing are memory crashes. So far crashes will happen with high level farms (level 25+) on iPad 1s, iPod 4s and devices with similar specs (please let me know if your situation is different). We really appreciate everyone who reported what device they're using and what level they are on as this really helps us determine what the problem is.
This becomes more of an issue the higher level you are; higher levels = more items and animations on your farm, causing these memory crashes. We're really sorry to hear how frustrating the experience has been for you guys! But we are working on a fix to reduce how memory intensive this game is - please be patient as we figure out a solution! In the mean time try removing unnecessary decorations from your game board (you can store it in the cellar), and closing out all background apps when playing Farm Story 2.