Ever since I update my Mac to Mojave, which was at the end of January 2019, I've been having major issues with network connectivity. So everything works fine in the browser but I can't download or update via App Store, it just remains stuck. Apart from that a message keeps popping up that Mac can’t connect to iCloud because of a problem.
I tried signing out of iCloud, rebooting, nothing works. When I click Account Details I get msg
Account Details could not be opened because of an error connecting to iCloud