I have a recurring event in Google Calendar that has no end date. Three times a week it sends me a reminder to do something. It was set to never end.
Recently I noticed I had stopped getting the email reminders. I checked my calendar, and saw that the event was no longer there. I went back a week and the event still showed on M,W,F.
I edited the event and still found that it was set to never end. I could not get this event to keep propogating.
The start date on the event was close to two years ago, so I made the start date the current date and that seemed to reset the event. That was a weird glitch.