What do you mean by "failing to quickly recognize and open PDF files", exactly? Do the files not open when you double-click them? If so, what happens? And does it work if you open them in the application directly, via File - Open? Also, what's your OS version?
I have the same issue. Adobe Acrobat DC keeps crashing. I double click and it opens for a few seconds and then closes out. I have the latest version on the Creative Cloud Desktop. My IT support has been working on it for over a week now. It works for them under their Admin rights but not for me as a user.
I am also having issues opening PDF files that I have previously never had a problem with. I am getting the following error message with literally hundreds of PDF files:
Adobe Acrobat could not open 'FILENAME REMOVED.pdf' because it is either not a supported file type or because the file has been damaged (for example, it was sent as an email attachment and wasn't correctly decoded). To create an Adobe PDF document, go to the source application. Then choose Save as Adobe PDF from the PDF dropdown in the Print dialog.