Is it the weather or what?

[#1]

My system has been stable for a long time, with download speeds around 10mbs and uploads at 1mb. But for the past three weeks I have had lots of disconnects and consequent speed changes - currently it is 6.6 down and 520k up. Before I start raising tickets, is there a general problem, such as the high winds interfering with telephone cables?  My exchange is Ruislip.
I should add that the router was switched off for three days last week but it has made no difference. And it has been rebooted a couple of times since.
Thanks for any help

[#2]

If you can post your router stats - noise margin, speed and attenuation we may have a better idea
This explains how to get them http://community.plus.net/forum/index.php/topic,96155.0.html

[#3]

Here they are
Port Status TxPkts RxPkts Collisions Tx B/s Rx B/s Up Time
WAN PPPoE 2858954 3853599 0 231786 736708 01:17:55
LAN 100M/Full 0 0 0 0 0 3 days 17:50:59
WLAN 11M/54M 4005804 3223168 0 10906 3374 3 days 17:51:16
ADSL Link Downstream Upstream
Connection Speed 6655 kbps 527 kbps
Line Attenuation 20.0 db 7.5 db
Noise Margin 10.15 db 12.5 db

[#4]

The automatic systems must have seen some quite serious instability to have raised the default noise margins to around 12dB
The first thing is to raise a fault - disconnections - at https://faults.plus.net and see what comes back

[#5]

Thanks Oldjim, will do