iOS 12 iBooks issue (hang- phone heat)

Area:

iBooks

Summary:

Hi, after update to iOS 12, I found the update fine, except the iBooks, once I open any files (PDFs) the iBooks App hang and the iPhone X start heating immediately so I swipe the App up to close it... I tried it after a (Setup as new iPhone) and still there... I think there is Bug in the iBooks in iOS12 need to be fixed.

Steps to Reproduce:

Reset and delete all setting and content ( Setup as new iPhone) though iTunes. and set up the iPhone as new device.

Expected Results:

I think there is Bug in the iBooks in iOS12 need to be fixed.

Actual Results:

Version/Build:

iOS 12 ( current iBooks)

Configuration:

iOS 12 ( current iBooks) by iPhone X 265GB