I have an iPhone 6+ that is updated with the latest version and app

I was in DEnver last night waiting for my connection and eating dinner.

My gate was changed, but I never got notified. I arrived at the original gate and no one was there.

My gate had changed about 30 gates away.....

I hustled to the gate and boarded. We then had a mechanical.

Meanwhile I rebooted my phone and also did a soft reset. About 15 minutes later I got a bunch of notifications.

Any suggestions? Not sure if this is a common experience for the App or a phone issue.