The Barriers!
Those things are funny for all but five minuets!
you hit them and go flying out the track or damage your car even in small contact if you hit them wrong!
The actual damage model is amazing you can crumple the cockpit and the dashes bent wheels in the single seaters any kind of large hit will break a wheel which is totally realistic.

If only they could fix the barriers so when you hit them the car goes thud.
Not hit fly up in the air spin a load of times land back on the track roll etc

but otherwise what a game! what a net code!

It will be fixed in future patches but adjusting things that affect lap performance and hotlap times would mean completely wiping some hotlaps and putting out another patch so it is likely to be fixed when the next "Big" patch comes out.