Freezing on Ipod

GRRRR! I downloaded this game because it is awesome! But everytime I get past the dining room, and try to go to the next room, it kicks me out and back to the main screen. I noticed after, that some of my other games started doing the exact same things! Virtual Villagers 2, AND both of my Yard Sale games are now doing the same thing

I don't understand this, because when I first downloaded the games they worked fine. now all of a sudden one freezes and won't even go to the first page, others you can get past the menu, but crash shortly after, and yet the titanic I can do the first room, then crashes!!!ARG!!!!!I've deleted them off my iPod, and tried to re-download them, but it hasn't changed anything,.,

Any help would be wonderful!