The App Store is rejecting my application because of this:

We discovered one or more bugs in your app when reviewed on iPad running iOS 12 on Wi-Fi.

Specifically, App stuck on splash screen.

Everything works fine in the simulator and on my older iPhone. I don't have an actual iPad device to test on, and I see nothing in the simulator logs. Any idea what I can do to fix this? Any idea why it would freeze at the splash screen on iPad but not on iPhone devices?