Until recently everything was very fine with the software but since I upgraded to the latest NVidia video drivers,
If all was 'happy' before...then simply roll back to the earlier nVidia dreivers that were not a problem.
Especially with Graphic Drivers it is NOT always ideal to have the newest and latest. They typically will fix problems you might not even have, or have noticed...but add new ones you DO notice.
With those drivers the rule is... "If it ain't broke...." ...