Hope you are doing well and sorry for the trouble. As described, the Acrobat closes when you scroll down the documents.
- Is this a behavior with a particular PDF file or with all the PDFs? Please try with a different PDF file and check
- If the file is stored on a shared network/drive, please download and save the file to your computer first and then try to open it with Adobe Acrobat/Reader DC
- What is the version of the Acrobat DC and the OS you are using? To check the version of the application go to Help > About Acrobat and make sure you have the latest version 21.01.20149 installed. Go to Help > Check for Updates and reboot the computer once.
You may also try to turn off the protected mode (Win Only) and see if that helps. Go to Edit > Preferences > Enhanced Security > Uncheck 'Enable Protected mode at start up' Turn off the Protected Mode and Uncheck 'Enhanced Security' > Click OK and reboot the computer.
Note: Please turn on the security after testing to avoid any security risks.
You may also check out the help pages listed below: