iPad Pro screenshot bug

Hey Guys,

I have one problem with my iPad Pro (2018) model.

When I take a couple of screenshots and drag & drop them into Notability for example the iPad use to crash! Black screen appears for a few seconds and the lock screen comes up.

I only take one screenshot at a time, drag it into a document and then take the next one. It takes about 10 to 15 pictures and the iPad is down. Of course the iPad is running on the newest iOS version as well as on the newest Notability update. Furthermore, I went into an Apple Sore to get support. We tested some iPads in the store and the same phenomenon happened. So maybe there is a general bug into iOS?!

I am happy for any comments or recommendations.

Thanks, Nico