Welcome to the ROG forum.
I'm using the ROG Delta S Animate with windows 11 and all is working well.
The disappearing could be a sign of instability, try with your pc at default settings and see if your ROG Delta S Animate still disappears.
The latest version of Armoury Crate is 22.214.171.124
Click the pics to make them bigger.
When you reinstalled Armoury Crate, did you use the Armoury Crate uninstall tool? If not, you'll want to use it.
From the ASUS Support Center select your operating system then click Show all in blue, it's the third download. Once uninstalled, install Armoury Crate version 126.96.36.199, then head to the update center in Armoury Crate and check for updates.