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It seems our ElasticSearch was inactive and after enabling it, the issue has been resolved.
Thank you Jim!

Aside from what's already in there, there are no custom furls nor have any been edited.
I disabled all 3rd party plugins and apps, there was no change.
Our htaccess file:
<IfModule mod_rewrite.c> Options -MultiViews RewriteEngine On RewriteBase / RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_URI} !^/[0-9]+\..+\.cpaneldcv$ RewriteCond %{REQUEST_URI} !^/[A-F0-9]{32}\.txt(?:\ Comodo\ DCV)?$ RewriteCond %{REQUEST_URI} !^/\.well-known/pki-validation/[A-F0-9]{32}\.txt(?:\ Comodo\ DCV)?$ RewriteCond %{REQUEST_URI} !^/\.well-known/cpanel-dcv/[0-9a-zA-Z_-]+$ RewriteCond %{REQUEST_URI} !^/\.well-known/pki-validation/(?:\ Ballot169)? RewriteRule \.(jpeg|jpg|gif|png)$ /public/404.php [NC,L] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_URI} !^/[0-9]+\..+\.cpaneldcv$ RewriteCond %{REQUEST_URI} !^/[A-F0-9]{32}\.txt(?:\ Comodo\ DCV)?$ RewriteCond %{REQUEST_URI} !^/\.well-known/pki-validation/[A-F0-9]{32}\.txt(?:\ Comodo\ DCV)?$ RewriteCond %{REQUEST_URI} !^/\.well-known/cpanel-dcv/[0-9a-zA-Z_-]+$ RewriteCond %{REQUEST_URI} !^/\.well-known/pki-validation/(?:\ Ballot169)? RewriteRule . /index.php [L] </IfModule>

I am sending a probable FIX in the marketplace. Unfortunately I speak of probable because I have no way of verifying this until after the file has been approved in the marketplace. 
 

After restoring a backup, everything's good to go and we haven't encountered the problem again. Thanks Marc!

Thank you very much!

Thank you! I've figured it out.
We're using Medals as sort of adornments users can buy from the Member Shop app. Problem is, after redeeming the Medal, if a users decides they don't want it anymore, there's no way for them to completely remove it. I understand Moderators can remove Medals, but with 1000s of active users, adhering to everyone's request to delete Medals will get exhausting.