I have reverted the code refactoring in version 3.16.5. There are only small changes compared to version 3.16.0. Please install and let me know if that fixes the issue.
@Homeuse his/hers comment above is interesting though. If someone affected by this issue could restart their Shellies from the Web UI and then try the production version of my app (3.16.1) I’d like to know the result as well.