Radzen stylesheets sometimes not found

I have a problem which only seems to occur after I deploy my Blazor server app to the staging environment.
When I start the application, after deployment, I get 404 (Not Found) errors for two of the Blazor stylesheets. This behaviour is very inconsistent. At first the stylesheets are not found. But after a while they can be found.
But intermittently they cannot be found again. So, weird behaviour.

The relevant part of my _Host.chtml file:

    <link rel="stylesheet" href="css/bootstrap/bootstrap.min.css" />
    <link rel="stylesheet" href="_content/Radzen.Blazor/css/default-base.css">
    <link rel="stylesheet" href="_content/Radzen.Blazor/css/default.css">
    <link rel="stylesheet" href="css/site.css" />

I get the 404 errors for default-base.css and default.css. The other two stylesheet do not have this issue.

Any suggestions?
Thanks in advance

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