Hi John. I'm pleased that you've found a solution that works for you. I'm a little wary of doing a factory reset, as all my stuff is backed up to iCloud... Mine is a fairly new iPhone and to be honest, I've given up the ghost and deleted Google Calendar, which I'm not happy about as it's a much better layout than the stock iOS App IMO, but having gone back to the stock App I'm getting all of my notifications with no issues (as yet! ) Pity, because, I'm pretty hooked into Google via Photos/Email/Contacts etc..it would've been nice to keep it all there!