Gnome software seems to be dismal at handling error conditions. I solved a similar problem with Gnome on Fedora 25 a few months ago by deleting all of my Gnome

Gnome software seems to be dismal at handling error conditions. I solved a similar problem with Gnome on Fedora 25 a few months ago by deleting all of my Gnome Online Account entries. GOA and Evolution's data back end conspired to burn 20% CPU by failing to log into Google account servers multiple times per second. For hours.