Hmmm yeah in the past this could happen if there was a start up problem or severe network issues when trying to launch it. You say your notebook slows down a lot, do you know what its specs are or at least its age?
Maybe you could take a video of your game starting so I can see how bad the slow down is, it could be if the game is super-slow that maybe something is failing due to the lag?
Otherwise another option down the line would be to get you a version of the game that will save an error log, which we can then hopefully get from you and analyze. Talk to Trevor about getting such a version, see if you can make it fail again and then pass the error log to Trevor/Mojumbo.
Thanks!!