Game crash, after that unable to join multiplayer worlds

When I play on a multiplayer world with my friend, my minecraft suddenly messes up graphics so I have to restart minecraft. The mess starts with a blank red screen, and then a screen which looks like the pause menu, with a big minecraft logo, but you can only see the ,,minec". After the restart it says something along the lines: ,,Unable to load global resources" after that, I tried joining the world again, it says ,,Unable to connect to world". We tried restarting our games, it didn't work. Before the update, everything worked just fine!