I appreciate all the helpful suggestions. Thanks.
Still can't get Memtest86 to run....even downloading from a different site...
Brain is tired. Taking a break for the rest of the evening.
(Starting to feel a bit like Edison...when he said he'd "found 1000 items that wouldn't work as a filament"
)
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I did find some guy who posted on tenforum.com (for Win10 issues) about a year ago with seemingly the same laptop freezing issue on a different brand of laptop. There are more than 11 pages of "try this, do that, run xyz, etc..". I'm not sure what/if anything did the trick, as he posted 4 days ago that the issue seems to have recurred. He's in a hot part of the country, so it may be a heat-related issue in his case.
omni