Hey there, brakuz!
I'm afraid there's little we can do unless you help us out by supplying us with additional information.
Maybe you can tell us if the game gives you an error message, and what that error message says, as to help determine the problem. A more detailed description of your problem will go a long way to help us, help you!
It would be a good idea to post your computer's hardware specifications, as it could be related to the issue.
As the problem appears to be fixed by a restart, my unqualified guess would be that the problem is with your computer's memory, or something closely related to it, as a restart will clear this.
Light bless!