Showing white screen forever after splash screen

I am working on developing ionic app using ionic 3, that will support android 11.
I have tested my app on android emulators that have api level 30 and it working fine on emulators, no any white screen. But when i signed the apk and sent for test to client it is not working. The problem is occured for pixel 4a, samsung a71, samsung s10+.All are not working.
I have followed all the steps to set preferences for splash scree. Run the apk with ionic run android --prod but not showing any error.
Please help me to solve this white screen issue