Hello Dave,
nVidia seems to like breaking it with new drivers once a year. Fortunately, they can't anymore with Windows 10!
We would need to see the log files, like for every post you may have read in this forum, in order to formulate a pertinent reply. Older software is unlikely to help, Can you try an older nVidia driver (like last year or January this year)? This will give an indication of what takes place, but won't replace the need for logs to be analysed (3rd link in my forum signature).
Kind regards,
Alban
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