Starting from WordPress version 4.5, you can use RAND(seed) with the orderby parameter.
However, when the value is simply RAND (i.e. the uppercase of rand), WP_Query ignores it and defaults to the default sorting (which is by the post date).
I’ve confirmed that by inspecting the $query->request:
-
With
'orderby' => 'RAND', theORDER BYclause isORDER BY wp_posts.post_date DESC. -
With
'orderby' => 'rand', theORDER BYclause isORDER BY RAND().
So the solution is simple: Always use rand, unless you want to use a seed.
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