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Welcome to this user forum.
Is there any noise on your phone calls? Dial 17070 and select option 2, there should be no noise between the announcements.
Which BT home hub do you have?
You will need to test for noise using a phone, as noise on your line will cause dropouts, also the drop in speed is probably due to a disconnection on one wire of your phone line which will mean you will not get dial tone.
The line test that BT do, cannot detect a disconnection close to your home.
Buy a cheap (less than £10) wired phone to run a check.
Then dial 17070 (free call) and select option 2, quiet line test, and see if there is any noise on the line.
If you do not get dial tone, or there is noise on the line, then you need to report it as either no dial tone, or a noisy line. Do not mention the broadband problem, otherwise it will end up in the wrong fault queue, and take much longer to be fixed. There are plenty of people who can fix phone faults, but not as many broadband people.
Once the phone fault is fixed, then the broadband will get better.
Come back on today and let us know how you get on when you've connected the phone
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Can you please display the connection information.
The information contained within your router management pages can really help others diagnose technical issues. To post these stats, open up a web browser and type 192.168.1.254 or BThomehub.home. Navigate to the 'Troubleshooting' Tab and then click on 'Helpdesk', you will then need to enter the admin password which can be found on the sticker on the back of BT Home Hub 4 and 5. BT Home hub 3 will have the sticker on the underside of the router.
If using a BT Home Hub 4 or 5 navigate to 'Troubleshooting' then to 'Logs'. You will then find two lines which will state 'DSL noise margin' and 'DSL line rate', copy this info and include this in your post.
Run a Speed test and post the results
Visit BT Wholesale Broadband Performance Test pop your telephone number in and run the test. Once the initial test completes you will see an option at the bottom of the screen for 'Further Diagnostics' click this to run the full test. Once the result is displayed, copy this into your post.
Have you been resetting or disconnecting your home hub, as DLM have reduced your connection speed because it thinks you have a line fault?
Changes in your connection speed are automatically managed by the exchange equipment, using a process called
Dynamic Line Management (DLM).
Its purpose it to give you the best speed possible, without introducing a lot of errors back into the BT network.
These errors impact on other users, and can slow their connection down, as your data packets have to keep being resent.
This is a continuous process, but certain things can cause it to make drastic changes to your connection speed.
These can include the following:-
You could have also been recently moved from ADSL max to ADSL2+, this would mean that the line
would have to re-train again, and must be left undisturbed for at least 10 days.
If you keep restarting or disconnecting your BT Home hub, then the exchange equipment will see this as a fault
condition, and reduce your connection speed, in an attempt to stabilise your line.
You have recently had a fault on your line which has just been fixed.
Sometimes a single interruption to your line can cause this too, especially if it generates a large error burst.
The effect is that you get placed in a low banded speed profile, and you will notice that your downstream margin
is high, usually over 15dB.
The lower the banded speed profile, the quicker it will recover, but it could take up to a month before the full
speed is recovered.
If you want your speed to recover, then these are the steps you need to take.
DO NOT restart or disconnect the power to your BT Home Hub.
DO NOT disconnect your BT Home hub from your phone line.
Leave everything alone for at least 10 days, so that the exchange can record a stable connection.
During this time, the exchange may drop the connection, and re-establish a faster connection.
If you use the BT Speedtester, then do not restart the BT Home Hub, even if it tells you to.
If after 10 days your speed does not increase, then please return to your forum post
showing that you have 10 days of connection time, then the problem can be escalated.
You can calculate your final speed by using this website.
Maximum speed calculator