ios push notifications only work sometimes
I have an application that is essentially a park scheduling app. I have a iOS push notification setup to ask my users if they still plan on attending their booked park visit 15minutes before their visit. The problem is only 25% of the iOS push notifications actually show up on my device.
For example: If I'm going to the park at 9:00am, 12:30pm, 4:30pm, and 7:00pm I only end up getting notified for the 7:00pm visit at 6:45pm, but should get a notification for each visit.
Curiously, I have other iOS notifications setup to send me tips while I'm at the park and they almost always come through, but not the 15 minute reminder. Is there something I'm missing here?