Constant connection drop - really weird

Question

Since middle of december ive been having a really odd issue with my broadband.  Every so often (several times a day) my internet suddenly 'stalls' and nothing will load...then 20 seconds later my BB light turns orange and then back to blue and my internet works again.  This happens several times a day for no apparent reason and this is the router log from the last 2 minutes when it happened again...
23:59:39   6 Jan
LOGIN User admin logged in on [HTTP] (from 192.168.1.65)
23:59:36   6 Jan
UPnP action 'DeletePortMapping' from ip=192.168.1.65 (Action failed)
23:59:19   6 Jan
LOGIN User Basic logged in on [HTTP] (from 192.168.1.65)
23:59:12   6 Jan
PPP link up (Internet) [123.123.123.123]
23:59:12   6 Jan
FIREWALL event (1 of 1): modified rules
23:59:12   6 Jan
PPP CHAP Chap receive success : authentication ok
23:59:10   6 Jan
UPnP action 'AddPortMapping' from ip=192.168.1.65 (Success)
23:59:08   6 Jan
PPP CHAP Receive challenge (rhost = bras-red2.ls-bas)
23:59:00   6 Jan
UPnP action 'AddPortMapping' from ip=192.168.1.65 (Success)
23:58:58   6 Jan
FIREWALL event (1 of 2): created rules
23:58:58   6 Jan
FIREWALL event (1 of 2): deleted rules
23:58:58   6 Jan
PPP link down (Internet) [123.123.123.123]
Can anyone tell from that what could be going on?
This happens even when only my vision box is connected and nothing else is using the internet so that rules out anything on my PC causing the problem.
The logs included my IP address which I didnt want to make public so I changed it to [123.123.123.123] incase you were wondering why it was like that lol.

Answer 1

I have the same problem at an RAF base in Scotland.
There is one junction box in the block and router aerials in each corridor.
Despite the fact there's a router aerial right outside my room, the WiFi constantly drops out, even at 03:00 or 04:00 ! So not exactly peak time overuse!
Then it won't allow me to log back in again saying "maximum number of sessions reached".
I'm having to write this from my mobile phone, its 3G signal is faster and more reliable than BT Openzone.
It is unacceptable! We are paying BT every month for a service and they are not providing us with what we are paying them for!