The hotfix CD_22.214.171.12472 was issued to improve datalayer access at discovery service including closing unnecessary connections and catching general exceptions. To download this hotfix, please refer to KB article belowWhere can I find hotfixes for SDL Tridion/Web?
When applying this hotfix, it is essential to remove outdated jar files. For example, the lib subdirectory of the Discovery microservice should *NOT* contain both of the below jar files, just the latest version. This has been known to result in behavior which the hotfix would otherwise fix.cd_common_config_api-8.5.0-1026.jar
Also see KB article In SDL Web, Content Service throwing error - Not possible to retrieve the dynamic configuration