so i had a flight where this not happen. i remember it was not freezing, the client lost connection to the server and the window appears for reconnecting. maybe it was an issue that i didnt restart the pc after update whatever, i will keep an eye on it. the only thing what i recognize now, that online data for vatsim get lost. so on atc ribbon all frequencies get blank except unicom, and the controlled areas as well, but stations are still online on vpilot.