However, when I leave the computer alone for a period of hours - either going to bed and testing the next morning, or going to work during the day, and testing when I get back in the evening, when I perform a speedtest again, the download has sunk to 15-25mb, and the upload usually stays at 15mb (ish).
I'm using a Linksys E3000 with the standard Openreach modem.
If, under the status tab on the router, I disconnect the PPPoE, and reconnect, it seems to solve the issue.
Anyone experienced tihs before, or have any idea why it might be happening?
I've just enabled the log on the router, so maybe that might give some clues...