I just posted a pre-release version at https://github.com/FlyingDiver/Indigo-E ... /tag/2.1.8
This has some code changes to hopefully fix the issue where the plugin stopped attempting to refresh authentication after a server error. I found an example of this in my own system where the server reported "down for maintenance" during a refresh attempt, and the plugin stopped contacting the server. I have not been able to recreate the scenario again, so I'm not sure if this actually fixes it or not.
If you're getting any kind of recurring errors including failure to update, then please try this version.
If you have any problems, please open an issue on GitHub, including debug level log excerpts.
I will be traveling from this weekend until Christmas, so don't expect me to respond to posts on the boards. I will be severely Internet challenged for most of the month. I'll probably have more luck with GitHub issues as I can respond to them just by email.