Intermittent speed issues and high errors after ma...

Question

I had BT broadband installed 3rd August and was only getting 3.5 - 4.5 mbps (stable and consistent) despite having been quoted 6 to 14 mbps when I ordered.
After the standard call center checks BT eventually agreed to send out an engineer (4 days ago) who replaced the master socket with a new style one and the speed reported by my HH3 went from 4.5 to 8.5mbps... all looked good however since then the actual download speed has varied from 1.5 to 8.5 mbps and the error counts seem very high.
Latency has also switched from interleaved to fast and now back to interleave.
Any advice on how to get this stable would be much appreciated - thanks in advance!
Connection Information
Line state:
Connected
Connection time:
1 days, 11:30:30
Downstream:
8.768 Mbps
Upstream:
1.114 Mbps
ADSL Settings
VPI/VCI:
0/38
Type:
PPPoA
Modulation:
Unknown or no mode configured
Latency type:
Interleaved
Noise margin (Down/Up):
6.3 dB / 6.5 dB
Line attenuation (Down/Up):
32.1 dB / 17.5 dB
Output power (Down/Up):
20.4 dBm / 12.4 dBm
FEC Events (Down/Up):
182027426 / 534
CRC Events (Down/Up):
88180 / 138
Loss of Framing (Local/Remote):
0 / 0
Loss of Signal (Local/Remote):
0 / 0
Loss of Power (Local/Remote):
0 / 0
HEC Events (Down/Up):
209251 / 307
Error Seconds (Local/Remote):
31526 / 222
FAQ
Test1 comprises of two tests
1. Best Effort Test: -provides background information.
Download  Speed
3954 Kbps
0 Kbps
7150 Kbps
Max Achievable Speed
 Download speedachieved during the test was - 3954 Kbps
 For your connection, the acceptable range of speeds is 2000-7150 Kbps.
 Additional Information:
 Your DSL Connection Rate :8977 Kbps(DOWN-STREAM), 1139 Kbps(UP-STREAM)
 IP Profile for your line is - 7920 Kbps
2. Upstream Test: -provides background information.
Upload Speed
874 Kbps
0 Kbps
1139 Kbps
Max Achievable Speed
>Upload speed achieved during the test was - 874 Kbps
 Additional Information:
 Upstream Rate IP profile on your line is - 1139 Kbps
We were unable to identify any performance problem with your service at this time.
It is possible that any problem you are currently, or had previously experienced may have been caused by traffic congestion on the Internet or by the server you were accessing responding slowly.
If you continue to encounter a problem with a specific server, please contact the administrator of that server in the first instance.

Answer 1

Another set of mixed results this evening:
speedtester.bt reporting a max of 21meg and homehub is now reporting 9.21.
Can you please advise what speed you would expect based on my distance from exchange? My noise margin has gone from 5.1 yesterday to 8.3 today.
Connection Information
Line state:
Connected
Connection time:
0 days, 10:54:17
Downstream:
9.21 Mbps
Upstream:
1.098 Mbps
ADSL Settings
VPI/VCI:
0/38
Type:
PPPoA
Modulation:
G.992.5 Annex A
Latency type:
Interleaved
Noise margin (Down/Up):
8.3 dB / 5.7 dB
Line attenuation (Down/Up):
32.1 dB / 17.4 dB
Output power (Down/Up):
20.5 dBm / 12.7 dBm
FEC Events (Down/Up):
4092978 / 2283
CRC Events (Down/Up):
156 / 293
Loss of Framing (Local/Remote):
0 / 0
Loss of Signal (Local/Remote):
0 / 0
Loss of Power (Local/Remote):
0 / 0
HEC Events (Down/Up):
294 / 882
Error Seconds (Local/Remote):
172 / 88
FAQ
Test1 comprises of two tests
1. Best Effort Test: -provides background information.
Download  Speed
7289 Kbps
0 Kbps
21000 Kbps
Max Achievable Speed
 Download speedachieved during the test was - 7289 Kbps
 For your connection, the acceptable range of speeds is 4000-21000 Kbps.
 Additional Information:
 Your DSL Connection Rate :9430 Kbps(DOWN-STREAM), 1123 Kbps(UP-STREAM)
 IP Profile for your line is - 8319 Kbps
2. Upstream Test: -provides background information.
Upload Speed
879 Kbps
0 Kbps
1123 Kbps
Max Achievable Speed
>Upload speed achieved during the test was - 879 Kbps
 Additional Information:
 Upstream Rate IP profile on your line is - 1123 Kbps