FTTC broadband deterioration

Any thoughts on the following:

http://www.thinkbroadband.com/speedtest/button/14129...

Speed had been very good, flat at above 40Mbps, but sadly no longer.

I'm on Plusnet 80/20 FTTC and running Win 7

There is something wrong because the exchange SVLAN problem. I suggest u post it in this plusnet thread here http://community.plus.net/forum/index.php/board,74.0...

Once you posted - plusnet staff will check this for u.

Your http download x6 appears to be good and 6 times the single stream download. Could any other devices be using your internet?

At the time I was the only one connected.
I have since asked my son to test with his wired connection (too far for wifi) and was amazed he still had a perfect connection.
http://www.thinkbroadband.com/speedtest/button/14129...

I have since tested my wifi with similar results, all showing good x6, but single stream starting high and dropping off, except for this one which seems most unusual:
http://www.thinkbroadband.com/speedtest/button/14129...

I have checked my wifi channel and only one other user is using Chn 6 and I'm at 100% and they are 18% using Vistumbler, so interference should not be an issue.

With the wired access performance I guess it must be a wifi issue.
I have contacted Plusnet, but will check mine and other wifi connections over the weekend.

Cool. I guess my post was of some help!

The x6 does NOT mean we expect it to be six times faster than the tbbx1 but it is just showing the different in the number of threads used to do the test.

Suggestion is that congestion somewhere is happening.

Yeap wifi issues can show up the same as congestion, suggesting something may be playing with the signal.

NOTE: Stumblers will not show other devices that might be interfering with the WiFi of course.

Yes, it is definitely a WiFi issue, checked out by direct connection last night and it was perfect.
Today the wifi signal is much better and at the top end of my normal range
http://www.thinkbroadband.com/speedtest/button/14130...
so very pleased with my Plusnet FTTC performance.

I shall now need to check what may be affecting the wifi, but probably will just accept that I "drive at different speeds at different times"!

Thank you everyone for your help and advice.

A friend of mine had a similar problem eventually traced to this:

http://www.neowin.net/news/intels-wi-fi-adapters-con...