During a daily race on the Nurburgring GP, I was intentionally pushed off in the Schumacher S by someone, ended up two wheels out of track and losing the car. I t-boned the guy who pushed me, took negative SR and 10 seconds penalty. This was on the last lap, and I dropped from S to A, although I had mostly full clean races for at least a week and a half. Took 3 perfect races to get back to S, and first race I do after that, I get spun first lap, someone else t-bones me, 10 seconds penalty again and this time I get downgraded to SR B. Took 4 or 5 perfect races to get back at S again (which was easy to achieve since the game decided to put me mostly against DS drivers, I'm AS so pretty easy to avoid incidents when your opponents are 8 seconds a lap slower).
I think the game currently hates t-boning incidents.