Strange web traffic behaviour for previous week

Hi,
I have been experiencing strange web behaviour with my infinity 2 connection for approximately the last week. I say "web" because the connection speed for other applications is fairly rapid still, but general web browsing is very laggy.
I'm using mainly Apple kit. Time capsule plugged into infinity box. Two iPhones, two Macbook Airs and an ipad. Using a mixture of wired and wireless connections. All show the same issue for websites, where as pages will either take a while to load or half load and not respond until tried upon a second attempt.
Looking at network traffic it would look like what happens is occasionally some HTTP requests hang and eventually time out. I've tried VPN'ing out then web browsing via the VPN and it doesn't experience the same issue.
Anyone have any ideas or experienced similar? Sounds like some kind of BT traffic shaping or transparent proxy perhaps?
Thanks in advance...

I’ve done some analysis to try find out what is happening and come to conclusion there is definitely some packet loss going on which appears to be the cause of the problem. I’m not sure if this is the correct forum for this level of technicality but hopefully someone at BT will see this and act on it.
In the instances where the request fails, it is almost certainly because the TCP three way handshake does not complete. Specifically this is final ACK packet back from the client to the server is lost en route but strangely no ICMP error messages which you’d expect to see.
In the example log below a request to an asset on the BBC news website failed. Somewhere within BT, the final ACK to establish the connection is being lost; so the connection is in a kind of limbo state where it is trying to ask for a particular page asset but the remote server still thinks there’s an ACK packet to come. This is what is causing the actual ‘hang’ within the browser since it is waiting for data to be returned which never is.
21:19:27.626789 IP 10.0.1.2.56024 > 109.144.113.190.http: Flags [S], seq 303285671, win 65535, options [mss 1460,nop,wscale 4,nop,nop,TS val 197730955 ecr 0,sackOK,eol], length 0
21:19:27.639592 IP 109.144.113.190.http > 10.0.1.2.56024: Flags [S.], seq 2613461067, ack 303285672, win 14480, options [mss 1400,sackOK,TS val 236085456 ecr 197730955,nop,wscale 1], length 0
21:19:27.639667 IP 10.0.1.2.56024 > 109.144.113.190.http: Flags [.], ack 1, win 8241, options [nop,nop,TS val 197730967 ecr 236085456], length 0
21:19:27.641567 IP 10.0.1.2.56024 > 109.144.113.190.http: Flags [P.], seq 1:368, ack 1, win 8241, options [nop,nop,TS val 197730968 ecr 236085456], length 367
21:19:27.718538 IP 109.144.113.190.http > 10.0.1.2.56024: Flags [S.], seq 2613461067, ack 303285672, win 14480, options [mss 1400,sackOK,TS val 236085535 ecr 197730955,nop,wscale 1], length 0
21:19:27.718617 IP 10.0.1.2.56024 > 109.144.113.190.http: Flags [.], ack 1, win 8241, options [nop,nop,TS val 197731040 ecr 236085535], length 0
21:19:27.968834 IP 10.0.1.2.56024 > 109.144.113.190.http: Flags [P.], seq 1:368, ack 1, win 8241, options [nop,nop,TS val 197731286 ecr 236085535], length 367
21:19:28.271157 IP 10.0.1.2.56024 > 109.144.113.190.http: Flags [P.], seq 1:368, ack 1, win 8241, options [nop,nop,TS val 197731588 ecr 236085535], length 367
21:19:28.673944 IP 10.0.1.2.56024 > 109.144.113.190.http: Flags [P.], seq 1:368, ack 1, win 8241, options [nop,nop,TS val 197731990 ecr 236085535], length 367
So with this in mind, I’m open to as whether it is just web. It’s likely that it could be other protocols as well. It could be that web is more susceptible due to the number of separate connections that need to happen for each page view.

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