Save yourself some stress and strain and get another router!
As i have said in previous posts i had problems with speed, ports not working (common problem), broadband light going orange.
As suggested people said dump the BT router well Happy Birthday Broadband connection you are officialy 48hours old without no big drops or disconnection!
I have used a differnet router TP-Link and no problems, even at peak times max fluctuation 2-3mbps which is fine on an average 36mbps connection, upload has neverdroppped below 7mbps and 90% of the time stays at 8+mbps!
So i`d say to most people with problems get another router as this takes a big part of the equation away for problems, it still could be the line, but if you can try one do it! I wasn't getting discionnected evry 24 hours with the BT one, but i would have to turn it off and on to get a better connection.