Things seem to be behaving better, but I am not convinced yet that it is resolved.
I changed the driver to 8.0.478.0 (I assume this is what is installed with the Windows Update version) and then have again changed it back to 8.0.629.0 (both drivers were on my machine from various installs) and the change back to 629 seems to have settled it down.
Will see how it goes!
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