Calendar and contacts

Whenever I want to sync my iPhone contacts, and calendar app at the same time, my waze will either take long to load or won’t load at all.
Now I have to keep my contacts synced in and leave the calendar app out our it will crash

Needs sorting asap, bored of seeing the ‘connect your calendar message’

Maybe it’s because I have the iPhone 16 pro max and no one else is having this problem with an older model, because this didn’t happen on my iPhone 11pro