. Not the most frequent poster here
At this stage a move to Sky may help, but would not be the best course of action until the problem is sorted. It could very well continue with them and I wouldn't rate your chances with their support.
As an incidental, you are on a BT Wholesale service so subject to their DLM. One of the main features of that is the IP Profile system
, which is straight away lowering your maximum throughput to 1250kbps.
You seem to have two problems, possibly with the same or a linked underlying cause.
Your drop from a consistent 1.8Mbps to 0.7Mbps indicates a short-term fault or recent change. The 3Mbps you got for a short time points to both that and a longer-term issue.
Have a look at your attenuation, and read it off on this graph
. The average figures there are because of cases like yours being included. I would expect a connection speed of 4-4.5Mbps, giving you an IP Profile of 3500kbps or 4000kbps, with 3Mbps throughput at non-congested times. Like you got.
Fortunately the problem is probably on your premises
Please can you see if you can find, then post, your line stats. See here
Then the first thing to try is connecting your router to the test socket of the master socket, on the wall at the back in this pic
. Take the stats again immediately after connecting there, and post those for comparison. (Don't expect a throughput improvement there and then).
Importantly, connect using just the filter and the short ADSL cable that comes with the router. Do not use a phone extension cable to reach the socket.
That will give us something to think about. You might find reading the DLM and Noise Margin explanations on the site linked to for the IP Profile table are useful, and then read the relevant pages of the Troubleshooting section there. See if you have any of the potential problem causes described.
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