Windows 11 24R2 Sandbox doesn't work

[gdavej]

I'm having many problems since the "upgrade" to 24H2. The latest ones revolve around Windows Sandbox. I try to open the Sandbox (which worked perfectly before 24H2), and after 1-2 minutes, I get an error msg "The connection to the Windows Sandbox environment was lost.An existing connection was forcibly closed by the remote host. (0x80072746)" I saw suggestions on the web about this problem and the suggestion was to open Windows Features and turn off then on the Sandbox feature. I tried this and the window opens "Turn Windows Features On or Off" but then it just sits there with "Please Wait" in

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