Minecraft is still running properly, but the GUI disappears and the render is frozen. Only occurs on multiplayer for me.
Using the latest version on Curse, and Forge 10.13.4.1614.
The only thing that shows on the client console is [Client thread/WARN] [integratedcircuits/]: Shaders not supported, disabling aura effect :(
It also happens sort of randomly, but seems to mainly be when some chunks are loaded by the client.