Majority of them is related to multiplayer lobby. Don't know if any of the devs are aware of all them so I'm going to list some I remember: Flag icon randomly changing by itself after a race is finished; Transmission gear values sometimes only allow me to increase then when I try to change them. For example, McLaren GT3 gear values are these: 1.273 / 1.148 / 1.095. I quite common for me to change between the last two depending on the track, but sometimes the game just skip the "1.148" value and go straight to the value of the 5th gear. I can hear the sound of the menu but can't see which value was setup. It happens with others gears and with other vanilla cars too. Sometimes even modded ones are affected. The only solution I have encountered it to quit the setup menu and open it again; Sometimes the host just can't advance to the next section of the race. It shows us the message "Waiting for all clients to load", everyone load the game and we get stuck. Sometimes the host quit the lobby and the issue goes on
