Ever since I've been using a Billion Bipac 7800N router at home, I've noticed that my ADSL line's downstream SNR decreases over a number of days from 4 down to 1, then drops the ADSL connection and spends quite a while re-connecting. I noticed the dropped connection on Tuesday night when I had no internet access at around midnight - a quick check of the ADSL status on the router's status page at that point confirmed that the router was indeed reconnecting to ADSL and taking it's time about it.
I checked the SNR last night and it's now 3 and ADSL is connected.
Can anyone explain the above behaviour? Is it normal?