I just experienced this early this week. Very frustrating. I also posted to AWS forums and got zero assistance; am currently not paying for AWS support plan.

I just experienced this early this week. Very frustrating. I also posted to AWS forums and got zero assistance; am currently not paying for AWS support plan. This article came at an opportune moment -- it makes sense and removes the shroud of mystery around why it "works sometimes" which leaves me with an uneasy feeling for a production setup.