That photo looks OK to me, assuming the incoming cable is from the box by the window and that is fed from the entry in the loft.
I was a bit worried about the wires going into the back as sometimes non-BT people connect extensions/Sky boxes/burglar alarms to the hidden terminals inside that top part, and that can cause havoc if not properly done. We know you have havoc

.
I think you have three problems:-
1) Long-term instability which may be to do with your wiring setup, but I have reservations about that. Have you ever had a lot of disconnections and rung AOL, who "stabilised" the line?
2) Your less than ideal wiring setup, which is the question you raised in the first place. You have had plenty of good advice about that. Changing it should help, but I feel not dramatically. At least not in the short-term. It would probably need AOL to adjust some settings once done.
3) Simple congestion on AOL. We have seen connection speeds of 2172kbps and a couple around 2700kbps. A very low expectation (in my opinion) is half the connection speed as throughput, and a high expectation is 80% or more. 500kbps that you report is abysmal.
Remember, you should have a connection speed somewhere between 3500 and 4000kbps, according to your attenuation. Which ties in with you reporting speeds in the past of 3Mbps.
I suggest a useful thing to do would be to download
RouterStats Lite and see if it works with your router. From the list it is known to work with I reckon there is a fair chance. Just try the DGN1000 or 2200 settings.
I like 5-second sampling, 8 seconds at the most. MHC likes much bigger intervals. Make sure you get it to save the graphs, and I like to set it to log to a file as well. That way we can see how much your noise margin varies 24/7 for a few days, which might show your connection problems are in the past and we just need to get the noise margin reset in order to get a good connection speed. Or it might show you have a big problem with noise bursts still going on.
Along with the occasional speed test we should also be able to pick up on congested times of day - maybe run one every 2-3 hours and occasionally post the history list (copy and paste) - rather than posting links to the clumsy pretty results box every time.
If you can get RSL running now, then if you do alter the wiring we would get a useful comparison between the two setups.
My broadband basic info/help site - www.robertos.me.uk
My domains,website and mail hosting - Tsohost.
Internet connection - Plusnet Value Fibre.
"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Edited by RobertoS (Fri 08-Jun-12 23:13:25)