Those visual renderings are consistent with the audio file failing to load. I share your confusion, since you’re only fetching two audio files from the farm, so I can’t imagine the server being overloaded. Have you heard of other people experiencing this problem? I’m thinking it could be specific to your testing, if you sent multiple requests for that file across your test runs, maybe the server is being slow to serve it back, or your browser thinks it has a version in cache but fails to find it. I don’t know, really..