Delayed Notifications and Calls
I am getting issues with notifications and calls being delayed ranging from 5 minutes to hours. This hinders with my work as I don't receive calls in WhatsApp or in google duo until I open whatsapp or google duo, and I also receive missed call notification delayed. This issue is not device related or anything as my old iPhone XR also had similar problems since updating to iOS 14. I have tried the following steps:
1) Resetting all settings
2) Fidgeting with Notification Scheduled Summary
3) Changing to new iPhone
iPhone 12 Pro, iOS 15