I was given a code to the Little Big Planet Kart public beta. I downloaded & installed the game with no problems. The game started just fine and was playable. The trobble started when I went to quit the game.
It started the quiting process and the next thing I knew my PS3 made 2 beeps and restarted itself after which I uninstalled the beta and tried my other games. Everything seems to be working correctly right now.