[iOS] iPad when pressed home button and open app again it display black screen

I build my app and publish app on App store. I launch app for 1st time it work correctly after i close my app and open it again it display black screen.

FYI: I restart my ipad and open app again it display black screen.

Anyone face this problem ?

Thanks.

What it use: Unity version: 2019.4.30f1 iOS version on iPad: 15.3 (on iPad Air gen4th) / 15.2.1 (on iPad Pro)

I'm attached black screen image and attach vdo.