This looks more like a dbus issue than a network-manager issue, the connection is closed before you reach the dbus errors so i dont see why network-manager would be cause of this issue but would much rather someone with more dbus knowledge to decide.
This looks more like a dbus issue than a network-manager issue, the connection is closed before you reach the dbus errors so i dont see why network-manager would be cause of this issue but would much rather someone with more dbus knowledge to decide.