You probably have refer disabled or spoofed. "Fix" that and it may work
Re:Coronavirus Real Time Map
by tsukurimashou on Tuesday January 28, 2020 @08:48AM
(#22169286)
yeah no it was just load, otherwise it would not work randomly like that
Fatal Errors
Unable to load https://gisanddata.maps.arcgis.com/sharing/rest/content/item... status: 502
d@https://js.arcgis.com/3.31/init.js:112:340 d@https://js.arcgis.com/3.31/init.js:140:425 f@https://js.arcgis.com/3.31/init.js:145:35
Maybe the load is a bit too heavy for the app at the moment
EDIT: after a few attempts I was able to load the map, it is nicely done!