can you post any connection stats?
does connection drop about same time every night?
sound more like interference than a line problem
have you tried using the test socket with a filter to eliminate your internal wiring and faceplate from causing a problem - even if you currently use a filtered master socket
difficult to help with some basic connection stats information
connecting the hh3 wont help as all stats in the modem if hg612 you can unlock it (try google) but if ECI unlikely as needs to use soldering iron
Try searching 'REIN' and 'SHINE', unsuppresed electrical equipment switching on and off can cause your broadband to drop out, and especially this time of year when many houses are decorated with Christmas lights , is it possible that someone switching lights off around that time is your problem, it's not neccesarily your own electrical equipment, but could be a neighbour's
Mos Christmas tree lights now use cheap and switch mode power units, which can cause interference to broadband, but this would normally affect the connection speed.
Communityhelp (Private website) Lots of additional information and help.
You will need to be connected to your home BT Broadband connection to view it, or any links to it that I post on this forum.