Hi Simon,
I assume that all the machines can render such content. Since all is cached, I have very little to offer here.
The only suggestion that comes to mind is using the Team Render Server to ensure that needed content is distributed. This is a wild guess as I have not a single piece of information about your setup, which should be cleared by tech support. I can't typically replicate those setups here.
Please get in touch with tech support.
https://www.maxon.net/en/support-center
My best wishes