Mine has disappeared several times, pretty sure its a status you need to maintain to keep. As in if you stop posting/contributing and fall below the threshold of read posts your regular status goes away until you qualify again. Once you have it, it seems to stick for like a month even if you don’t post but once it does you’re back at square one.
This badge is granted when you reach trust level 3. Thanks for being a
regular part of our community over a period of months. You’re now one of
the most active readers, and a reliable contributor that makes our
community great. You can now recategorize and rename topics, take
advantage of more powerful spam flags, access a private lounge area, and
you’ll also get lots more likes per day.