Two visits from engineers can't find problem, BT d...

Question

Would really appreciate any help with this. Problem has been going on a while. Internet speed two mths ago dropped to half a meg. (Am meant to get 11Mb).  The problem was 24hrs a day unuseable speed back then.. BT engineers came out about a month ago and changed the router, renewed the wall socket and microfilter, checked everything and replaced equipment at the exchange. Said they couldn't find the fault but just as they were about to give up, speed started coming through. After they left, speed increased to around 7MB but, every night at around 9.30ish, speed dropped to half a Meg again and internet unuseable.  Kept a log and this happens every single night between 9.30 and 10pm.  BT engineers came out again last Friday and could not find fault. They replaced the line to the Exchange and said everything physical that can be done has been done.  It didn't make any difference.
All weekend, speed drops to around half MB and unuseable after 9.30ish.  This happens immediately, I can be watching Iplayer and then, bang, no internet.  Computer is high performance, about one month old and has been restored to factory settings just in case. There is nothing in the house that turns on or is interfering with the broadband at that time.
There is one master socket in the house which the line is connected to. Old dead sockets upstairs from prev tenants. Line was put in when I moved in. There are no other connections to my line. 
And then, tonight, internet speed was down at 6.30pm. Managed to run bt speed test which said:
 FAQ
Test1 comprises of two tests
1. Best Effort Test:  -provides background information.
 Download  Speed
 52 Kbps
0 Kbps 21000 Kbps
Max Achievable Speed
 Download speedachieved during the test was - 52 Kbps
 For your connection, the acceptable range of speeds is 4000-21000 Kbps.
 Additional Information:
 Your DSL Connection Rate :15928 Kbps(DOWN-STREAM), 1040 Kbps(UP-STREAM)
 IP Profile for your line is - 12000 Kbps
2. Upstream Test:  -provides background information.
 Upload Speed
 813 Kbps
0 Kbps 1040 Kbps
Max Achievable Speed
>Upload speed achieved during the test was - 813 Kbps
 Additional Information:
 Upstream Rate IP profile on your line is - 1040 Kbps
I could not do third test because the hub won't accept the password which is written on it but its a new hub so I don't think it is the problem. 
Engineer said keep ringing the callcentre and calling engineers out again but they don't know whats going on. He said it could be 'rain' on the line from someones faulty equipment but its rare.  Worried now the whole thing is going down again because speed dropped so early this evening.. would switching providers solve the problem? but then if its still a BT line, how could it? Seriously tearing my hair out about it all. Call centre want me to check line all the time but as I can't get on the internet when it happens, all a bit pointless.  Line has been monitored and no feedback so i assume they think its ok.  Please help.

Answer 1

sounds like you got the correct thing, I use the plusnet one but any one really does.
Ok if not congested then as IMJOLLY says contact one of the mods
At the top of the forum thare are postings from KellyG, click on the name and in the profile text it says the link to use to contact them. Will take them 3 days to reply probably
If my post was helpful then please click on the Ratings star on the left-hand side If the the reply answers your question fully then please select ’Mark as Accepted Solution’