It will recover, in most cases though it could take 2 - 3 weeks though. With any VDSL connection, it's best not to cause it to disconnect too often. If you do have to disconnected the modem/router then leaving it disconnected for 30 minutes should mean that line management won't kick in and when you restart it, the speed will be no worse!
*The occasional disconnect is fine - it's repeated disconnects that make the cabinet and modem think they have a problem!
