Program freezes

Playing on local network on another person's world. Host person is on iPad4. All players have latest iPad software version and alpha 0.7.3 minecraft update. When visiting player went to sleep and then attempted to leave bed, game frozen in mode where guest player appeared to be jumping up and down quickly and continuously. Only way to make this stop is to completely close the program (remove from running programs list) and restarting. Happens every time guest player attempts to leave bed. Occurred to another player on iPad2, host player iPad4, but player was simply walking when it occurred. Again, only way to make program unfreeze was to completely shut minecraft down by removing from list of running program and then restart program.

Thanks,

Noelle