Are you trying to open the race in the 3D viewer? If you are, can you try using the 2D viewer by going into the settings toggling it to 2D, and spectating a race, to see if this fixes your issue.
I have the same issue as of yesterday, can't load race, can't load to view other people's either. I usually use tablet but had to use my phone yesterday instead so it's not the internet connection.