Ya... I should have used Bitlocker on the previous tablet that got the power/charging connection problem.
Because I did not, I can't return my still-under-warranty tablet for replacement. Maybe it's just paranoia, but I don't want to be vulnerable like that with my personal id/password files.
Live and learn.
On the replacement tablet, no personal files are loaded.
Will probably upgrade to Pro- on Win10, when it's made available.