A detailed description of the issue: Two leageu races were in practice as in the race i receive the pop up witch says "You must be connected to Xbox live". Happens most of the time in the first or second lap in that session.
Platform: Xbox One
What version of the game you are using: 1.08
Ranked/Unranked/Leagues: Unranked and leagues, Tested in ranked lobbies where I found no problems in the two 5 lap races.
Wired or Wireless Connection: Wired
The amount of players in your session: in league races it was 18-19 people, in the two tests it were 2-3 persons