Hi stu_clouds,
I hhave spoken to out 2nd line suport team about your issue, and they are advising there is no known issue with RDP on the smart hub, they have asked if you can export the logs that shows the drops and send this in to us with the phone number of the broadband line and the serial number of your router, we can get the issue looked into for you.
If you contact us with the details the helpdesk can get a case raised and pass the details to out 2nd line suport team to get looked into.
Markp