Just to add another layer of intrigue, I think my router may be playing up which could be the cause of, or contributing to, this occasional issue. For quite a while now when I access the router's admin page (i.e. 192.168.1.1 for me) it sometimes takes 15-20 seconds to load.
I still have the Raspberry Pi, via telnet, logging SNR every few seconds. Today when I went to the admin page it took a while to load and I noticed the SNR dropped from 5.5-6.5ish to about 4.3. Once the page loaded, the SNR rose again to 6ish. I tried it a few times and the slow-loading admin page definitely hit the SNR.
I wondered if it was to do with load on the router, so I tested downloaing a large file and the SNR did the same during the download - in fact it even stopped telnet reporting the SNR for a while.
I don't know why accessing the admin page is sometimes slow, but I don't see why it'd actually affect SNR. Same for downloading a large file. Is this something to do with the way the router's reporting the SNR, or is it possible the router's playing up and it's not able to process the DSL signal properly?!
The router is a Billion 8800NL which is 4.5 years old.
Edited by davidw87 (Sun 19-Jan-25 13:05:10)