Hi, I have the same probs with that. Unraid 6.8.3. All Vm´s that switched from or to GPU Passthrough to VNC back have the problems. I find out that after switching the Grafik output the "bus" from  0x00 chnaged to 0x07. With these settings the vms dosen´t work. After change the bus back to 0x00 the vm works fine. If the bus 0x00 is occupied, change the slot to 2 or 3. Sorry for my bad english :-) <model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1' primary='yes'/>    
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