Occasional 404 - file not found for file: SSO/ error with SAML module

Hi all,    For a while now, we've been having issues with the SSO connection for one of our environments. We're receiving “404 – File not found for file: SSO/”errors while trying to login through SSO (similarly, “sso/” and “sso/assertion/” produce the same results). This happens around half the time we're trying to approach the URL. We're running an application with multiple production nodes, and we're only seeing these issues on a single node. All the apps are running on 2 instances, use the same configuration for SAML and have the same release package deployed. We're currently running version 1.13.0 of the SAML module.    Does anyone have any similar issues with the SAML module or does anyone know how to solve this? 
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