If you are using any other app that schedules charging, such as Optiwatt, you should make sure that the scheduling function on that app is disabled. It overrides the Tesla scheduldd charging function. I had the same issue, and when I deleted Optiwatt, the problems disappeared. I then reinstalled Optiwatt and made sure the scheduling function on Optiwatt was disabled and the Tesla scheduled charging function has worked fine ever since. I shared this with Tesla service, and they confirmed that third party apps can conflict with Tesla’s function and should be disabled.