That is not what happend to me, not even close. I have taken some pictures of what I did for that to happen and make it clearer to understand.
I pressed 'start' to send a message to another player in the lobby, while on track at Ascari. Like so,
View attachment 163732
And auto drive took over as it does, but instead of slowing down, it speed up and hit the gravel trap (pictured on the right.)
I then herd tires squeeling and a crash impact sound. Where it had hit a wall of some sort (physical or invisible, can't remeber) The car was like this,
View attachment 163739
And then reset it's self to track.
I have tired to remember and recreate as much as possible from memory, to illustrate what happened.
This is nothing at all like the driving in lobby menu glitch.
This should clear up what happened, it is a new glitch not a existing one.