Game won't load at "press enter to start" screen

I press enter, the video in the background of the Senna freezes (didn’t know if that’s important/says anything but thought that I would include it anyway), and the game attempts to load for about 5-10 minutes and then says that “an unknown error has occurred, please try again later.” It has been doing this for a few days now. The first day I had the game it worked fine.