amp-iframe: intermittent loading (Acast podcast player)

[AaronMLB]

Description

I use amp-iframe to deliver Acast's embedded podcast player, as per their instructions.

This has been working since I redeveloped my site in AMP around a year ago, but has recently become intermittent - failing and sticking with the spinning loading indicator more often than it resolves.

I've clarified the same behaviour amongst a number of different users, devices, browsers and operating systems, all experiencing the same.

Example code:

<amp-iframe width="900" height="350" layout="responsive" title="Episode 414 - Lauren Pattison" sandbox="allow-scripts allow-same-origin" frameborder="0" src="https://embed.acast.com/thecomedianscomedianpodcast/414-lauren-pattison"></amp-iframe>

The source format adheres to that given in Acast's example, as do the sandbox attributes and other key values. This was, as I say, consistently working until recently (roughly the last month).

Running #development-1 on the page returns a number of warnings and a couple of errors, but nothing associated to amp-iframe that I can see.

Any help in understanding or rectifying this problem would be extremely appreciated.

Reproduction Steps

Visit: https://www.comedy.co.uk/podcasts/comedians_comedian_podcast/episode-414/

Relevant Logs

No response

Browser(s) Affected

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OS(s) Affected

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Device(s) Affected

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AMP Version Affected

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