It is hard to tell what is going on from your description. I have not experienced this myself. I was wondering what the specs of your computer are and what is going on with it. For example if your computer is fairly slow and you are rebooting it fairly frequently, it is possible that everything is working correctly just that there is not enough progress being made for checkpoints to be made (wherein it can restart from the checkpoint and not have to restart from the beginning). On the other hand, it could be just a bad install. I have seen people discuss this and a re-install fixed it. Anyway, someone with experience at this will hopefully come along soon and provide a more substantial answer.

Well I know its not from me restarting, because my computer has been running for almost 5 days. I have just uninstalled/reinstalled it, I will post tomorrow whether this fixes it