This happens to me usually.What you should do,is try re-downloading the game.Its more-likely to be your computer,not being able to handle loading all of FeralHeart.Have you tried using a different computer/laptop? That would do the trick.You may want to delete a few things on your computer,so it would be less likely to lag off.Go to control panel,and then you can see all the things you've downloaded,to see how much they've taken up.
~Hope this helped.