This capsule is served by Drew DeVault's gmnisrv, which has been crashing a lot recently. Thanks to ~ew and Ben for getting in touch about this, and to Martin for doing some investigation! Apparently some other gmnisrv users were also having the same problem.
Thanks to Eyal Sawady, this bug has now been patched, so it's a good time to update gmnisrv if you use it :-)
If you want more info:
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Callum Brown, 2021-05-16
Licensed under CC BY-SA 4.0