right you should be getting speeds of around 3000 Kbs.
I will explain the max is 7150 is the max you will receive on any line advertising up to 8Mbs as bt reserve part of the line, the 7150 is what you would get if you were right next to the exchange and contention ratio wasn't an issue, connections are shared as there is simply not enough capacity, you share the bandwidth available from the isp and the exchange with others, I believe for residential it is at a ratio of 30:1.
Your are currently synced at 3456Kbs and should be achieving at least a 3Mb download rate, you are getting 82Kbs.
Your acceptable speed range before BT wholesale or Sky will consider it a fault is between 600-7150 Kbps, it is then considered below the fault threshold.
Bascially you need to get your ip profile reset, the exchange will then determine your max stable speed which will take around 10 days but you would notice the effect within hours.
But this does not solve the underlying cause, a very common cause for this is an intermitent connection this can be caused from many different things but it can also be caused by restarting your router alot as the exchange cannot detect the difference between a line fault and you powering off the equipment.
Before you go the the next step have you ensure there is no malware on your computer, to do so follow these instrctions
http://www.computerforum.com/131398-important-please-read-before-posting.html
But I think you are going to need to call sky and explain your problem to them but to give you a heads up they will probably ask the following things to change the micro filter and the plug it directly into the test socket, which is behind the normal phone socket once you unscrew the front, these are very rarely a problem but I have known one instance, in my house none after the thousands of calls I took a BT BB support, but you will probably need to call tech support and tell them to sort out the line as the line will not sort it self out quickly if at all if they dont reset the line.
I am on plusnet and I have had a simalar problem recently, speed dropped from 0.65 Mbs, I know so fast that if you blink you'll miss it
, to 0.120 Kbs and they reset the line within half an hour it was fixed.
Sorry about the delay in respone I thought you had given up on the thread.
