Getting logged out when trying to download from Web2 Portal?

Hello, I'm looking for some help on an issue my company is having with our PDM Professional Web2 portal. Every user is able to log in, browse the folder structure, and even preview a file. As soon as the user attempts to download the file, they are brought back to the login screen, and unable to complete the download. This happens to every user, and with every file download attempt. The actual PDM vault functions as it should. We are running SW 2020. Any suggestions are greatly appreciated!

Thank you,
Wade