Unknown Domain Errors from eBay

Over the past week we've seen a number of unknown domain error coming from ebay.com. They look something like:

Fastly error: unknown domain: www.ebay.com. 
Please check that this domain has been added to a service.

Details: cache-XXXX

We're already aware of it and are working with eBay to come up with a fix.
We've seen that it is to do with HTTP/2 connection coalescing and affects mostly Firefox users.

Until we are able to fully resolve this we recommend that you try initially reloading the page in order to allow it to load correctly. If you are still receiving the error you can try loading the page in a different browser.