Laravel page expired 419 only sometimes

Question

I have a view in my Laravel application that has a form with the @csrf inside. The problem is that I faced the 419 Page expired exception only sometimes.
When I refreshed the page, the login page appeared and after login, a few times the form submission was done successfully but again, 419 occurred.
I saw the other topics. All of them told that the solution is adding the @CSRF directive to the form.
But in my special case, the @CSRF exists.
Help me please.

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Update

Here is a part of my source code. It's a simple html form with the @CSRF inside it.

<form method="POST" action="/settingUrl">
    @csrf
    <input type="text" name="myfield" />
    <input type="submit" value="save" />
</form>