reply to oipluckie
Re: [netopia] Speed drops on 3347 Record modem stats during good times and bad. It is not unusual for margin to vary a couple of dB but eight is a lot. Check to see if sync speed stays the same. As margin goes below 10 dB modem becomes more susceptible to noise. At 6 and below connection will get unstable.
8 PM is an interesting time - are street lights going on about then?
Changes in margin could be due to other users or problems with wiring. Does your DSL share a voice phone line? If so how is voice service? Any noise on the line especially when the phone is first picked up? What about crosstalk, other voices? If so there is something wrong with your physical circuit.
Try connecting the modem directly to the phone company NID test jack. Do this at good times and bad. If stats are better something within your residence is degrading performance. If problem is within you residence it is your responsibility to correct. DSL is more sensitive then voice so the NID test is worthwhile even if phone sounds fine.
Connect a phone to the test jack. If noise persists call voice repair.
Try doing a traceroute (tracert in Windows) to stable sites like this one during good times and bad. Latency should gradually increase with hop count and distance. Sudden unexplained increase probably means congestion on that or the previous hop.