Hi, @wyck, thanks for giving these steps a go and sorry to hear this hasn't resolved the issue for you.
We're unable to offer further assistance in device troubleshooting outside of what I sent through in my previous comment. At this point, I would strongly recommend reaching out to your service provider or performing a factory reset of your device to resolve the issue.
There may be additional resources online that go through the steps to disable this mode specifically on a Sony Xperia XZ Premium that isn't covered in our general Android steps above, however, I haven't personally come across a device where these steps haven't worked - so this is definitely a first!