Was having problems with some internet seach links being blocked and my quicken bank update failing an internet connection. Turned off Norton 360 VPN and everything working fine now.
I have noticed this too . It usually happens over wifi. I have found if you do nothing but restart the machine all comes back fine . It could be that the wifi connection is dropped?
https://community.norton.com/en/forums/norton-security-blocking-quicken-program
https://community.norton.com/en/forums/vpn-blocking-dl-banking-information
https://community.quicken.com/discussion/7880263/internet-connection-error-with-vpn-turned-on
https://community.quicken.com/discussion/7867032/updates-and-norton-vpn
source: Google > Norton VPN + Quicken