Private Lobby Crashes After 3 Laps

Is anyone else having this problem?

Everytime I start a private multiplayer lobby race with just yours truly and a field of drivertards I only get 3 laps before being disconnected from the session and landing back in the lobby.

I just want to have a race with only the pre-war DLC cars I’ve paid good money for… is that really too much to ask? I wonder if Gran Turismo does pre-war…