Our monitoring indicates that the issue has now been resolved, and services should now be returning to normal. We will continue to monitor throughout the day to ensure the issue doesn't regress

Our hosting provider is currently experiencing connectivity issues on their platform for apps which use wildcard subdomains (which includes Range Mate). More info available here - https://status.heroku.com/

We are monitoring the situation and will update ou here once Heroku engineers have been able to resolve the issue.