Speed dropped to 10% of what it should be

[#1]

Just noticed today that my 40/2 connection has severely dropped in download speed. It had been running at full speed until now.
Here's the results of the BT Speed Test:

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1. Best Effort Test:  -provides background information. Download Speed 3.94 Mbps 0 Mbps 38.67 Mbps Max Achievable Speed Download speedachieved during the test was - 3.94 Mbps For your connection, the acceptable range of speedsis 20 Mbps-38.67 Mbps . Additional Information: IP Profile for your line is - 38.67 Mbps 2. Upstream Test:  -provides background information. Upload Speed 1.3 Mbps 0 Mbps 2 Mbps Max Achievable Speed Upload speed achieved during the test was - 1.3Mbps Additional Information: Upstream Rate IP profile on your line is - 2 Mbps This test was not conclusive and further testing is required.This might be useful for your Broadband Service Provider to investigate the fault. If you wish to carry out further tests,please click on 'Continue' button.If not, please close the window using 'Exit' button and contact your ISP for further assistance with these results.

[#2]

@njc2k
Welcome to the forums.
As an aid to finding a solution to the problem, whet does the speed profile from Plusnet at https://portal.plus.net/my.html?action=data_transfer_speed say? No ned to post anything other than the speed shown there.
Sometimes the Plusnet profile speed is reset to the ADSL speeds and hence a slow down occurs. You will need you Plusnet username and password to get that information.
Also is it back at full speed today as it maybe congestion at your exchange if it is only occurring in the 6pm to 10pm peak usage window.

[#3]

Speed has recovered today
The speed profile page says this:

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Estimated line speed: There's no speed estimate currently held on your account. Current line speed: 38.6 Mb

[#4]

Hopefully a Plusnet staff member will post here soon and look at your exchange to see if there are issues there for you.
If not, raise a fault when the BTW speed tests  shows it is slow. When you have a slow speed test, do not do any more as Plusnet can only see the result of the last BTW test.
http://faults.plus.net/

[#5]

Hi @mjc2k
Tests aren't showing any obvious causes for a fault.
Please head over to http:/faults.plus.net if that's still proving to be an issue.