Most problems host changes for me are in Assault or Flag games.
1: This has happened to me twice, where the host leaves honestly within seconds of the game ending, and when the game returns back, its back at 20:00 minutes.
2: When the host leaves as soon as the round is ending, the next round will have the time the last round had, and not the full 3:00 minutes.
Host changes are pretty bad most of the time.