Hello,
I've been monitoring my download speeds over the course of a month and my download speeds have dropped to 20mb. When I started to notice speeds declining I spoke with support and they sent another Super Router for testing, I used it for a week or so and it didn't improve my speed at all. My pings were also sat between 39/45ms. Suspecting that that the routers themselves were at fault I went and bought a netgear d6400, my speeds didn't improve when using it but my ping dropped back down to a decent 13/14ms and the connection was a lot more stable on both wired and WiFi compared to the talk talk routers. Over the course of the month I checked the sync speeds on all routers and they displayed the same results of 23998 down and 19000 up. I also noticed that the maximum achievable for download was sat around 97000. Unfortunatley, I ended up knocking the sync speed 20000 whilst switching around routers to gather information from each of them, which I think clocked it as too many disconnections, but apart from that one instance whilst I have been using the netgear router, I haven't had any speed drops which. I am aware that the HG633 has a lot of issues at the moment and that's what makes me believe it's caused the speed drop.
My upload speed has remained the same throughout the course of the month. Also my download speeds use to sit between 59mb/65mb before this started happening and when chatting to support they said they tested my line and didn't detect any faults. I don't believe there's any noise on the telephone line either.
I hope I have supplied enough information and apologies for any grammar/spelling mistakes as I have typed this using my phone.
Regards
Luke