Ok all, I have this list so far for data points. Are there any other data points you have seen that I am missing?
- Seems to affect routines more than other smartapp schedules
- sunrise/sunset are affected for some users
- Changing the original schedule to a new time (+/- 1 minute) can solve a schedule issue but most people find the schedule fails again in a few days.
EDIT: Keep this specific to time based events failing