It always was, and I'm assuming it has just dropped off, so this is just to draw attention to that...
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4\$\begingroup\$ Community removes the featured tag once a month and, shortly after, a mod adds it again. Just flag the sandbox question. \$\endgroup\$ – Dennis Jun 20 '15 at 18:42
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As Dennis said, there's a cron job that runs every Saturday and removes the featured if it's been used for a month. If you notice this, just flag the sandbox question with a custom flag or let us mods know in the Nineteenth Byte so we can add it again.