There is a bug for online play. Your are flying along then it is like someone presses the escape key and the game screen comes up and you can't get back into the cockpit, but your plane keeps on flying and you usually die from crash if you don't disconnect or hope it goes back to normal. It could be a cheat or someone running the server being an azz, I really don't know. Maybe others can confirm.
This was on a 4.101 server