Having this problem for months now. Only way for me to not crash my system or get a DX9 restart (which sometimes lag my entire system) is not to open any other windows; Chrome, Window Explorer, even notepad. Now I can't even use ffxivclock without fear of either 11000002 appearing on dx11 or a restart on dx9 that might slow the entire system down....

Using the R9 280x; already did the usual DDU sequence of stuff and even reformated my comp and reinstalled everything.... Still the same problems.