Can I check that you mean it when you say you're using the hub in router mode? With a decent piece of kit like the RT-AX88U I'd expect the hub to be in modem mode, and then the light is officially "magenta", which looks red to my eyes.
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Thanks very much for posting the details about your connection.
I've taken a further look and can see that your broadband is currently being impacted by a Utilisation Outage. The issue has been identified and our engineers are working on getting this resolved. The estimated fix time is currently 15.00pm on 30th July 2021.
Can you please confirm for me if you are now in full router mode?
No, I've not turned my modem into router mode as I'll lose Wifi connectivity to half of my house (I have a mesh network) so its not a solution I can work with long term. I could turn it on temporarily if you need to run troublehsooting.
If the problem is going to be ongoing until end of July, how do I claim bill credit for four months of unreliable service?