I have been on a medium fibre connection for 3 years and as the fibre cabinet is less than a mile from the exchange have always had good solid speeds of around 36Mb/s. My router advises me of the connection speed and normally stays unchanged at 39999kps. On 17 October it reported a speed of 18384 and, the next day it dropped to 16494 where it has stayed ever since. I have turned off the router for periods of more than 20 minutes and even overnight to see if the system would correct itself. A speed check on Talktalk reports 15.5Mb/s and no apparent fault on the line, even though this is below the estimated miminum speed of 18Mb/s for my line. I know the current speed is just above your miinimum guaranteed speed of 13.4Mb, but it should not have dropped so significantly.
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