I believe I am beginning to see the affects of the changes Heroku announced a few months back. Today my instance of River4 has been stopping throughout the day, but restarts whenever I open the dashboard. In effect, it looks like I have to keep the Dashboard open in order to keep the River4.js app running, otherwise it goes to sleep.

This is probably going to affect my ability to access my river from mobile devices, and so I may have to re-think my strategy. We will see how it goes, I might just upgrade to the hobby dyno.

After further thought I've decided to close my Thinkup account and pay for a Hobby dyno on Heroku.