Comment # 21 on bug 1204162 from Lin Ma

(In reply to ulfbart from comment #20)
> ...
> After longer time (config not touched since them) I started the Win10 again,
> but seams that this workaround don't work anymore :-(

So far, I can't explain why this happens again, especially it occurs without
any changes.

How about the this one?
> > * Keep pc-q35-7.1, Deal with yellow bang devices: "Uninstall device" ->
> > "Scan for hardware changes" through "Device Manager".
> >   (According to comment#10, The VM has lots of yellow bang devices, They're
> > not working correctly)
> 
> Not tested yet


Actually, Even if the above one can workaround the issue, Using paravirtualized
nic(virtio-net) is recommended.
> > * Using virtio-net instead of e1000e/rtl8139.(vmdp-win driver is required)
> > E.g.
> > <interface type="network">
> >   <mac address="xx:xx:xx:xx:xx:xx"/>
> >   <source network="default"/>
> >   <model type="virtio"/>
> > </interface>