Internet dies when using Lightroom Classic

Inquiry.

Your copy if the Adobe Creative Cloud Desktop App (ACCDA), I assume it is running, but are you signed in?

Do you leave it alone (signed in) as most of us probably do 

Note that a common diagnostic test for connectivity issues in Adobe is to intentionally sign out in ACCDA, then sign in, watching for errors, messages, issues. Remember however that signing out of ACCDA deactivates the Adobe CC apps on the computer, signing back in activates (and accredidates)

Please post your System Information as Lightroom Classic (LrC) reports it. In LrC click on Help, then System Info, then Copy. Paste that information into a reply. Please present all information from first line down to and including Plug-in Info. Info after Plug-in info can be cut as that is just so much dead space to us non-Techs.