503 errors almost exclusively for Mobile Chrome

Im am trying to make sense of 503 errors, which I only see in the HTTP Requests for an innocent css file in a worker. I almost exclusively see them only for "ChromeMobile" (Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Mobile Safari/537.36). Does anyone have an idea, what could be causing this? Maybe debugging tips? I have checked the CF status page, I only see this for as single css file. The embedding document of the css file are 6 Iframes placed on a Webpage. I have tested this on Browserstack with different Android devices.

Is there a way, I can find out what actually "caused" the 503?
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