This is a glitch that some users report once every few months, and fortunately it's nothing to worry about. Your old reports are always safe and sound, and your newly reported bugs will eventually arrive.
What happens is that our servers can't service your requests at that exact moment. Everything usually gets back to normal within 10 minutes. Read more in this article: What is Shake's uptime?
What do I do now?
As soon as this happens to you, just let us know whether by chatting to us using the bubble in the bottom right corner, or emailing us at firstname.lastname@example.org 📬