Speed getting lower every day since adsl2+ upgrade

Question

Background : My router has always from day 1 been switched off at 11pm at night and turned back on at 7am in the morning. With adsl max I consistently had a download speed of 850Kb/s
2 weeks ago my line was upgraded after a phone call to BT, initially everything was great, speeds were not much better for the first coupld of days (950Kb/s) but then shot up to 1250Kb/s for a few days. Since then however my line has been getting slower every day. Today is the worst and I am now getting 690Kb/s.
I know I'm going to get the usual "leave router connected for 3 day" answer of someone, but what does this achieve ? If my line says connected at 6.5Mbps and I leave it on for 3 days solid does that mean 3 days of being stuck at that speed or does the line recalculate connection speed at certain intervals ?
ADSL Line Status
Connection Information
Line state:
Connected
Connection time:
0 days, 00:18:41
Downstream:
6.5 Mbps
Upstream:
1.11 Mbps
ADSL Settings
VPI/VCI:
0/38
Type:
PPPoA
Modulation:
G.992.5 Annex A
Latency type:
Interleaved
Noise margin (Down/Up):
7.3 dB / 6.0 dB
Line attenuation (Down/Up):
28.6 dB / 17.8 dB
Output power (Down/Up):
19.1 dBm / 12.4 dBm
FEC Events (Down/Up):
181278 / 0
CRC Events (Down/Up):
0 / 0
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):
0 / 0
Error Seconds (Local/Remote):
0 / 0
Thats my line stats as it stands , down from 11Mbps connection a week ago . Cannot connect to the main socket as where the line comes in the house is just a blank faceplate with a cable coming out the bottom into a smaller box then out and accross the room to the only phone socket in the property.
At this rate I would have been better staying on my old package instead of being made to take out a new contract at less favourable terms.

Answer 1

Nothing but a phone connected to the line. The sky box has never been connected to the line as last year when we got a Sky HD box slowed the connection right down.
As for the router being on for the 10 days, no one ever said that to me. The only reason I know that turning it off daily could be a negative was through this forum.
As for my original question. If I now leave the router on permanately does it reconfigure the connection istelf or does it have to be reset every now and then. Very frustrating going from 850Kb/s on adslmax to 1200+ then down to sub 700.
I am unable to run a speed test at the moment , but with only the homehub connected to the master socket the results look like much the same , The hub seems to be connecting at bang on 6.5Mbs every time so I assume the line has been set to this by the DLM ? How long on ADSL 2 does it take to work its way back up ? I ran a speed test earlier today and I belive my IP profile was 5.85 or some such , why would it be set so low when the line was happy at 10+ last week ?
ADSL Line Status
Connection Information
Line state:
Connected
Connection time:
0 days, 00:03:17
Downstream:
6.5 Mbps
Upstream:
1.106 Mbps
ADSL Settings
VPI/VCI:
0/38
Type:
PPPoA
Modulation:
Unknown or no mode configured
Latency type:
Interleaved
Noise margin (Down/Up):
9.9 dB / 5.9 dB
Line attenuation (Down/Up):
27.9 dB / 17.3 dB
Output power (Down/Up):
18.3 dBm / 12.4 dBm
FEC Events (Down/Up):
61 / 0
CRC Events (Down/Up):
0 / 0
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):
0 / 0
Error Seconds (Local/Remote):
0 / 0