AAAAARRRRGGGHHHH !!!

Hi,
Sudden speed drop !!
Up to 20 July was getting 72-73 Mbps download, 18.80 Mbps upload and a ping of 18-19 ms - my download IP profile was 77 Mbps.
On 23 July I test the speed because I thought pages were loading a little slowly and it came back as 61Mbps download, 18.50 Mbps upload and ping of around 31-33 ms - a BT Wholesale test stated my download IP Profile had dropped to 65 Mbps
Now, I accept that in the grand scheme of things, a download speed of 61Mbps is pretty good (compared to some on here), but I've spent what seems like a year of my life on the phone to India as, in my opinion, something has changed and caused my connection to be impacted??
The chap I was talking to basically said that as far as they were concerned, if it was higher than 44 Mbps, I should be satisfied!!
Two of my friends on Infinity are connected to the same cabinet as I am.  One of them is about 100M closer to the cab than me, the other about 20M further away than me.  Whilst they are only on Infinity 1, they both get max speed (38-39Mbps) and have a ping of around 15ms.
I had an engineer here at the end of May who diagnosed a line fault as he said the lines were over 30 years old!!  He stated I was less than 300M from the cabinet and when he tested my connection at a pole 50M from my house he was getting 76Mbps - from that point, he said there had clearly been some sort of wiring issue in the past as he could see new overhead wiring linking the two poles together, bypassing some the underground wiring. 
It's such a shame that all the investment in fibre rollout if crippled by antiquated street wiring!!!
Could it be the recent warm weather that's caused this??
I'm certain it's not what the bloke on the phone said "lots of customers have joined BT in your area and your speed has been lowered to accommodate them" !!!  Did they all get connected on 21 July ???

Ray,
Thanks for the info.
What I've got to do now is convince BT that there is a problem "somewhere" !!
I think I understand the DLM system, in so much as the IP profile is progressivly lowered if the system detects disconnections/problems on the line - that's what I experienced in April/May when it gradually went down from 72 -> 67 -> 64 and then settled at 59 Mbps.
After the Engineer vist at the end of May it went back to 72-74 Mbps download and stayed there until 20th July.
This time, it's just suddenly been chopped from an IP profile of 77 to 65, literally overnight.  The kids are moaning at me now 'cos the ping has gone up so much that it's getting them killed online !!!!

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