My ADSL2 line has now been reliable for about a year. Over the last few days, when the connection has dropped, I checked the S/N ratio using Routerstats Lite and can see that the S/N ratio drops from 3db to 0db for a few seconds every 4 minutes. Looking at the graph the period between the drops is very repeatable. After about 30 seconds, the modem recovers and broadband works for the next 3 1/2 minutes.
Swapping out the Netgear DG834V4 for a DG834PN makes no difference to the result.
The question is:- can anyone think what could cause a spike of interference every 4 or so minutes in a regular pattern?
I have seen noisy lines + fluctuating S/N ratios in the past, but never a regular and repeatable sequence of signal drops.
