Playing co-op career on xbox one series x, with full practice, full qualify and 35% race.
Finished the first season and did the first race in Australia just before the most recent patch
We have never had any network issues during the first season and the race in Australia.
After the Australia race, the most recent patch was release, and we have had 3 races (2 races in china, and 1 in japan) where the race disconnected our race.
This has happened over 2 playing sessions (two different days) and in 2 instances one player was kicked to the lobby and in the last instance both players got the message that the other player left the session, however the race continued for both of us, but not synced.
Nothing has changed physically for any of us, we are located in the same country.
We are both on 1000 Mbit internet, where the xbox is connected with cable.
Xbox service was functioning just fine, and our provided internet was just fine