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.
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!