Vision on demand stops working from 7.45 - 11.00 e...

Question

Hi , Can the powerline adapters cause on demand issues at the same time every night?
 Since Sunday all on demand and BBCI player (through BT Vision) content stutters and stops from about 19.45 - 23.00ish
It works fine at any other time and bbci player through the ps3 works fine. I have not had this issue before and we would be watching on demand, streaming on the pc and surfing on the tablet all at the same time in the evening with no problems.
I have had vision since feb 2010 same set up no new electrical devices etc .
My vision box is the black box  - not updated to version 2
Platform/OS Version WinCE/5.0.1400
My Hub is version 2 (The black one with a phone on the front)
I have restarted the hub, power cycled the hub, done a hard reset on the vision box.
I spoke to BT last night and they are sending me new adapters (I had the old white ones) they said that the problem was caused by the adapters and that I should of had mine replaced anyway because they had been recalled.
It was only tonight that it clicked that it was happening at peak times, my speedtests are fine the agent I spoke to last night said my speed was fine at their end.
I took a speedtest before I called again this evening 
1. Best Effort Test: • -provides background information.
Download Sp..d
8.99 Mbps
I
0 Mbps 21 Mbps
Max Achievable Speed
Download spe.dachi.ved during the test was - 8.99 Mbps
For your connection, the acceptable range of speeds is 4 Mbps-21 Mbps.
IP Profile for your line is- 11.42 Mbps
2. Upstream Test: • -provides background information.
Upload Speed
0.72 Mbps
0.83 Mbps
0Mbps
Max Achievable Speed
Upload speed •ch.v•d during th. test was - 0.72Mbps
Additional Information:
Upstream Rate IP profile on your line is - 0.83 Mbps
We ware unable to identify any performance problem vath your service at this time.
It is possible that any problem you are currently, or had previously experienced may have been caused by traffic congestion on the Internet or by the server you ware accessing responding slowly.
If you continue to encounter a problem th a specific server, please contact the administrator of that server in the first instance.
We have identified that you have additional services enabled on you broadband line, please click continue to run advanced service tests.
Test Results
I. video Service Quality Test: ö-provides background information.
Video Service Quality Test Passed
We were unable to identify any performance problem with your service at this time.
It is possible that any problem you are currently, or had previously experienced may have been caused by traffic congestion on the Internet or by the server you were accessing responding slowly.
If you continue to encounter a problem with a specific server, please contact the administrator of that server in the first instance.
Please visit the fQ if you are unable to understand the test results.
As you can see I am getting nearly 9 at peak times  more often 10/11ish ( vision also worked fine when my line was a max of 8 until the recent "upgrade").
The video Service quality test also passed.
I asked if the QOS (?)was OK on my line this evening and I was told yes -as in October I had experienced V04 errors due to the upgrade and a damaged wire causing issues with my BB which had caused the portion of line saved for vision to be stuck too low (BTs words) this was apparently fixed. I asked if this was ok and could it be connected this evening and was told no everything is fine.
I'm a bit confused because he started going on about my box  could be deterating and how the new update would fix it but then said the hub and box should last for years. also he said it was the adapters but then mentioned busy times?
Sorry for the long post I am just worrying that I am going to have weeks of different agents saying different things and everytime I ring starting from the begining - I have had similar issues with other problems before and have always found the community here ( and the mods) the most helpful.
So could it be the adapters or is it something else?
(also I'm really worried that this will be used as an excuse to move me on to youview [ I'm not in a infinity enabled area] and if i put my postcode into the checker it says I can't have vision -I don't want to lose ESPN before i have to)

Answer 1

It gets worse at about 20.00 it was still alright so I ran the speed tester and got this:
The test has successfully completed
Test Results
1. Best Effort Test: -provides background information.
Download Speed
10.25 Mbps
0Mbps 21Mbps
Max Achievable Speed
Download sp.eedachieved during the test was - 10.25 Mbps
For your connection, the acceptabl, range of spe.ds is 4 Mbps-21 Mbps.
LP Profile, for your line s 9.4 Mbp.
2. Upstream Test: -provides background information.
Upload Speed
0.74 Mbps
0 Mbps 0.83 Mbps
Max Achievable Speed
Upload speedi achieved during the test was - 0.74Mbps
Addthonal Information:
Upstream Rate IP profile on your line is - 0.83 Mbps
We ware unable to identify any performance problem rmth your service at this time.
It is possible that any problem you are currently, or had previously experienced may have been caused by traffic congestion on the Internet or by the server you were accessing responding slowly.
If you continue to encounter a problem with a specific server, please contact the administrator of that server in the first instance.
We have identified that you have additional services enabled on you broadband line, please click continue to run advanced service tests.
My IP Profile has dropped from 11.5. when I pressed continue I got this