I've been having the issue when just the IP address drops but not the connection from BT. For example the below ADSL Port section would be all 0s for IP address. The connection is still all there but obviously no internet connection.
|IP Subnet Mask||255.255.255.255|
|Gateway IP Address||172.16.12.6|
|Domain Name Server||188.8.131.52|
|IP Subnet Mask||255.255.255.0|
|ADSL Firmware Version||A2pB023o.d20e|
|DownStream Connection Speed||5638 kbps|
|UpStream Connection Speed||832 kbps|
The Other issue is I will be connected at 5-6mbps with it running at 6db snr and getting 4-4.5mbps on the LAN but then it will drop to 1mbps throughput but no changes to the linked speed and snr and would get a really high ping. all this has been tested with a wired connection on multiple devices and with different modems to rule out hardware issues. I have the latest faceplate with new wiring and shielded adsl cable.
Thanks for completing the test @Jamesstevens. We'll need to take a closer look at this for you so can you please drop me over an email with your details? You'll get the contact the moderators link in my profile.