This is a problem with the game not saving the progress due to connection issues. You would need to start a new town - as it`s not possible to get all the stuff back. However before you do we`ll need to figure out why your connection wasn`t working right.
Make sure you don`t run any other application in the background while playing DoF - from youtube, to internet browser, or not downloading anything. In addition it might help to restart your internet modem/router.