New pages alternate between loading and throwing a 404 error

Recently, any new page I deploy on my website is acting strangely.

It might initially load correctly, but after a reload the browser displays a 404 error. If I keep reloading, it will just alternate between the two states.

The behaviour is independent of device and browser (I’ve tried Chrome and Safari) and the problem does not occur when testing on my localhost.

I stripped back the page code (just incase it was a dodgy script):

<!doctype html>
<html>
<head>
    <base href="/admin/">
    <meta charset="UTF-8">
    <title>Test Page</title>
</head>
<body is="dmx-app" id="test01">
    This is a test page
</body>
</html>

In Project Settings I have ‘Use Routing’ and ‘Add Auto Base’ both set to ON but that hasn’t caused problems with any of the previous php pages within the admin directory.

Does anyone have any suggestions I can try? Or let me know what other information to provide.

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