Hi Henry, I apologize from the late post.
My problem started occurring summer 2020 and I finally discovered the issue. My hosted feature layers are unresponsive and are unable to load when I am connected to my works network through VPN! There is an extra proxy/ firewall when through VPN and the hosted layers try to load a second time, causing them to be unresponsive. Thankfully if I disconnect from VPN, everything works fine.
Thank you for your reply last month.
Emma