Just an update, I have called the Optus support number and they said they are trying to work out the technical difficulty they are experiencing with Tenplay. They will text me as they progress in fixing the problem. Hopefully it won't be too long. But it's not something that any of us are doing wrong and by the sounds of it it's not our modems.
Thanks for the update cmmillar1974. Hopefully it get's resolved soon. I'd still recommend everyone affected raise a fault with our tech team, so they have details of customers experiencing the problem and you can get the fix once it's available.
For Brookster, the gen 1 box had a blue dog on the front of the box.