For those seeing this me and a few others have been able to make it go away by either logging out and then close the browser and restarting it and logging back in. ( a few people I know did it that way) When it did it to me, I had some updates to do on my computer anyways, so I just rebooted my computer, when it fired back up a few minutes later I was able to post again with no issues, and haven't seen it pop up again. Hope this comment can helps a user getting that message.
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Did the same with the log out, restart browser. I thought it was my connection so I also reset my modem. It worked so I didn't think much of it until I saw this post.