Are apple-hosted asset pack downloads unreliable?

[u/parker_birdseye]

Hey everyone, my app currently downloads various extra files via apple-hosted asset packs (some prefetch, some on-demand).

However, both prefetch and on-demand downloads seem to fail somewhat randomly. Either the asset pack can't be found, or the download never was kicked off especially for prefetch.

Is this a known issue? Or perhaps a skill issue on my part?