Moved from sky to BT in December since then terrible connection slow drops out. Fed up phoning BT wasting hours doing the same things over and over, tried to cancel want £235 plus lose my line rental I paid up front. As soon as November comes round I'm off shocking Customercare.
Have you tried the quiet line test dial 17070 option 2 you should hear no noise if you can hear noise then it needs reporting to BT faults on 151 with no mention of broadband in the call are you connected to the test socket using a new filter
if using a hub 4 locate these lines located in the hub logs Lines should look like this 19:11:29, 07 Nov. (2290101.460000) DSL noise margin: 7.00 dB upstream, 6.10 dB downstream 19:11:29, 07 Nov. (2290101.390000) DSL line rate: 448 Kbps upstream, 288 Kbps downstream
The stats for the Home Hub 6 can be found on the Information page from http://192.168.1.254 then Advanced Settings -> Technical Log.
Can you run this checker and post back a screen shot of the results. Make sure you delete your phone number before posting.