I've had a very strange situation happen. Got in my '16 Mustang Shelby tonight and wanted to go get an A tune for it. As soon as I hit "Get Tunes", the tune screen came up and the screen froze with just a buzzing noise in the background. After about 5 seconds or so the game crashed back to the dashboard. Went back in to the tunes screen, it did it again. I did it four times in a row and it crashed each time.
When I got back into the game I tried four other cars of different classes and I was able to go into Get Tunes for each one of them. Went back and got into the Mustang again, went back into Get Tunes again, crash.
This time when it reloaded I deleted the Mustang, went back and bought it again, Get Tunes, crashed again.
So apparently there is a problem with that Mustang file, I guess. I've certainly never seen it happen on just one particular car.