It's the IP profile which is limiting your download speed. This indicates that at some time recently you must have had a lower speed connection than you currently have. This isn't at all unusual with such a long line, and keeping your connection running at the higher speed is likely to be a bit hit and miss.
In the first instance, can you hear any crackling or hiss on the phone? If so, check that you still hear it with a corded phone, and everything else disconnected from the line. If you still hear it, then report it to your phone provider (dial 151 if it's BT) and report it as a voice fault; don't mention broadband.
If there's no audible noise, then the next thing to do is to make sure that your own internal setup is as good as it can be. There's a lot of information about that on the
troubleshooting page and other linked pages.
To get more information about the state of your connection, you could install
Routerstats Lite (scroll down the page to see it) which should be compatible with your home hub. This will monitor the noise margin and show the result as a graph which can help to diagnose problems.