Stop Sign In Pop Up

I have Adobe Acrobat Pro DC. Everytime I open a pdf file, if I don't have another pdf already open, I receive a pop up asking me to sign in to use the product and access my membership information. Why do I need to sign in? The product is already licensed. I close the box and get another asking me if I am sure and then close that box. I can then continue viewing the pdf I opened. How do I turn off this pop up? It is very inefficient and is driving me crazy, as I open dozens of pdf's daily.