Unlikely in this case. Fedia.io is not hosted behind Cloudflare, some other Fediverse instances might be. But that should not result in 500 errors.
What did change is that Jerry is seeing a lot of ActivityPub traffic and at the same time Jerry is testing out our latest release candidate (Mbin software) https://github.com/MbinOrg/mbin/releases/tag/v1.9.0-rc1