It's something that's always happened to me on a variety of different computers and internet connections. Almost every single day I have to open 2D atleast 3 times before the race because the window completely freezes.
What's more annoying is that every time this happens, everything you've done resets. Like I can open 2D, change my push settings from 2 to 5, untick kers, do all the normal things, then sit there chatting to people for 2 minutes. Then it jams, reopen it, and everything is back to default. 2/5 push settings, kers is ticked etc.