All topics related to this issue are closed so I guess we should start a new one every time?
On lap 2 (not exactly sure) of this race http://igpmanager.com/play/?url=race-result/293427 both live timing and 2D windows turned to connection error screens. After reopening them everything went fine. All managers got kicked out and had to rejoin. I think this must have happened in other leagues too though noone has reported yet.
You guys asked us to report when this happens to investigate it, so hope this helps :D