Why PDFs Crash iBooks on iOS11 and how to fix

iBooks crashes with new iOS 11.

I first upgraded my iPad air and was no longer able to read my PDF documents due to crashes every single time I would try to open up the PDFs. I ended up re-installing iOS 10 just so I can read my PDFs again. I later upgraded my phone to the new iPhone X with iOS 11. My PDFs once again still crashes iBooks every time. This is a serious problem and I am looking for other alternatives. I have since upgraded to 11.2.6. I still have the same problem. I am surprised that this is going on unchecked and that no one else is having this problem.

I wish I could downgrade the iPhone X just so that way it’s more functional for my work and readings.

Please help. Thanks.