help~~how to recreate direct3d device in dx11 like dx9

our game uses cryengine3 , we found some of our users reveived unexpected device_removed error in dx11/ device_lost in dx9 , we force recreated d3d device in dx9 and it worked fine for those users,but this engine can't recover itself from device_removed error in dx11,so i tried to add this process ,i met a problem: the return value of SwapChain::Present is alwasys DXGI_ERROR_DEVICE_REMOVED after the new d3d device is created,i can't find the reason

here is my steps

1. flush all rendering command

2. release device resources created with the old d3d device,such as all textures ,buffers,queries,render stats

3. release the old swapchain and d3d device , create new one

4, recreate all resources released in step2

5 resume rendering

the return value of present in step5 was DXGI_ERROR_DEVICE_REMOVED , but any other return values from D3D API before present was S_OK

i also tried to simplify the rendering pipeline, i removed all d3d api calls except a present, after recreating a new device, the render thread stalled in present, it even did not return. here is the stack info from visual studio

does any one know any clue about my problem? thanks!!!!