It seems like my web maps and web apps are having issues with hosted feature services from AGOL.
Each time the web map is loaded, a different layer will give the error - <Layename> cannot be added to the map.
I also notice that some layers that successfully loaded on the webmap were returning error 400 when debugging the issue on the browser.
As most of our feature services are sitting on https://services1.arcgis.com, was wondering if anyone else is having the same issue.
AGOL Health dashboard reports that everything is fine.