I am currently unable to join my realm without crashing it, and I am also unable to download or replace my realm. The only message that appears is error.

Whenever I join my realm, I get your typical loading screen then enter my world. I manage to be able to walk around for five to ten seconds before getting the disconnected screen, hearing from my servermates that the world crashed, and having our progress be reset to the last backup. No error message appeared. So I decided to download the realm then reupload as a workaround. BUT now when I try to download I get a box that looks like this:
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If it helps, the server is vanilla, no mods or even textures added. No specific error message has happened. Everyone else can access just fine, and I am the only one ever having issues. I have checked Reddit and Minecraft Forum too, and many people have this same issue. I am unsure why nobody has reported it.