Dang I haven't had that happen to me yet. Luckily it just freezes and locks up and then crashes to desktop and displays that DirectX Error for me for now. It's done it once per day so far. If it does it again tomorrow I'll come pack and post again.
One interesting thing to note is that when it crashes to the desktop, it completely quits out of the game and quits out of Steam even. I noticed this when Steam was no longer running in my taskbar afterwards. I also noticed my desktop icons were all gone and bugged out. The crash basically made me have to end the "explorer.exe" process and re-initialize it from the task manager in order to fix the problem. Either that or just restarting fixes it too.