as we read quite few users experiencing disconnections after upgrade to Madsl - i just tough to post this few lines - which surely will help few.
few days ago - another user recomended to change your modem - to make sure the hardware is able to cope with the new maxdls 8 mb.
after i also experienced disconnections - i bought a new modem - Trust md b100 modem for just approx 20 £ - wich can handle up to 8 mb.
the swap of the modem from an alcatel speed and touch bought back few years ago - with a new modem that is designed and can actually handle the 8 mb of maxdsl - completely fix the problem of disconnections - and further increase maxdsl speed.
therefore if you still do not have a modem that actually is designed to handle the 8 mb and you are on maxdsl - - that could be the cause of your disconnections.
once your maxdsl is working correctly - is really worth the pain !!