Annoying minimization

[Timothy Murphy]

For some months (if not years) some action of mine -
maybe moving the cursor near an edge of the screen -
causes the window to be minimized,
and I have to press the Restore button in the top right corner
to get things back where they were.

This is particularly annoying when playing KPatience,
when the card one is clicking suddenly moves to the other end
of the screen.

Is there any way of avoiding this misbehaviour?