How do you know its TT changing it, and not the router dropping the ADSL connection to reconnect?

The honest answer is that I don't know.
I leave the router on all the time and, some mornings when I open up my emails, the connection has been changed.
I leave the PC on with my mail open.

Router works independently of PC.

The IP is changing when the router re-syncs due to a discon. It should not make any diff to you.

So, somewheer a disconnection is being made, but not by me?

The difference is that the speed usually drops when it changes. That is why I suspect TT to be involved somehow.

The line is long and unstable. it simply discons when it can't sync anymore. It's your line; not TT doing anything.

Have you tried test socket? Tried diff filters? Removed ring wire? What extensions have you?

Did you try changing router's Mode to ADSL (G.DMT) as suggested? That taxes the line less.

I'm with AOL and had similar problems and I think the same router ('n' with 2 USB ports?).
The router was flaky from day one but I got round the difficulty.
In November I had a fault on the line.
In January I still had as fault on the the line etc. etc.

I changed routers and even bought a new ASUS - still all over the place.
After Christmas, I got really fed up and after a lot of threats -
BT OR engineer 1 turns up out of the blue just we were going to the vet. Back in about an hour, we cheerily said . Less than an hour later no BT man and no telephone service.
Then another BT man turns up to fix the phone. We have a cable fault 6 meters away from the socket! Nuffin to do with last BT guy!!
Re-route cable via a spare pair to box at bottom of road. You need a broadband specialist, he says.
Another BT man comes, changes socket and can find the sync at over 9m. Goes to connect to internet and finds he can't. Then apparently I was using another connection 0 which died when he pulled the plug out!
Off to exchange and rings me up to say still working down there, but AOL won't talk to him.
This Monday I'd have enough and rang to find out if they had cured the fault. Closed at the beginning of February they said and anyway you are getting the maximum available on your line (by this time I'm syncing at about 5m). For some reason I am lying and their data is spot on. I get asked if I want to speak to a manager and I just said if that's all I can get, what's the point? Manager comes on, speed test done, conversation goes along the sorry saga and then I am asked to do another speed test. Funny, but it's now over 9meg. Re-profiling done.
Why does it take 4 months of going round in circles?
This afternoon Talk Talk rang to ask if everything was OK. I did express my concerns about the time and effort by everyones when I suspect not a lot was wrong that a large club hammer wouldn't fix (preferably in India!)
I'm sure it would be cheaper and better for their business if only..............................

Have an ADSL box on the line coming into the house.
There is an long lead from this box to the Router and the Router is connected by cable to the PC.
Ring wire is a mystery to me.
There is a phone plugged onto the box with an extension to an upstairs phone.

No, I may pluck up courage tomorrow for that!