Hi Wildheart3,
I have since found what was really causing my problems with alerts. I had an old iPad from work that sat unused in a file cabinet. When I dug it out the battery had died and the date/ time had set itself to 01 Jan 1970. After recharging and resetting the date and time through settings I did a factory reset and removed the device from my iCloud account. My alerts have worked perfectly since (going on 2 months now).
Cheers,
John
Hi John.
I'm pleased that you've found a solution that works for you.
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!