All of my tests of the farm were done at normal speed, and I never paused the game during the tests. It sounds like something is getting set incorrectly (somehow) in your game. If that happens to you again, and you don't mind helping to figure this out, try putting your game on pause and leaving it there. Check on the game periodically while it's paused to see if the farm comes back (trust me - this makes sense). I can't say for sure how long it might take, and you wouldn't be able to play the game during this "test" (so don't spend longer on it than you're comfortable with). I will set up a game to see if I can recreate this, too. Could you give me a scenario that might produce this problem?