At today's GT challenge races when some players left the server I had a huge freeze (1.3 seconds). Car vehaved as if it had stopped in time. During the first race (only trace for this one as the realtime got overwritten) it was when Remco Majoor left the session. In the second, I don't remember which player trigged it. Remco's car model was incorrectly showing as my 650s, although the other player which triggered the issue had the correct car model assigned. Another supposed to be M6 also left the session whithout any issues. There was also some other small freezes, distributed randomly. trace and realtime logging from race 2 in the link.
We had this issue tonight. Always a nice small freeze when someone disconnects and also sometimes a random person gets booted when someone leaves the race.