Today I can’t play. 4/4 runs are ended with a crash: disconnected from the host or directly the host is crashed.
@FatsharkJulia I would want give to you more informations… but sadly I haven’t them. I just know that, yesterday, I’m crashed on 4/4 runs. Sometimes for my “fault”, sometimes for host’s fault.
Today I have not had problems.
If you catch any crash reports, please send them my way. 
Next time I will do it, thanks.