Thanks for your time and the detailed replies!
I decided to leave this for a little while (as you can no doubt see!), so I could sort out some (probably) more important things in my life. More important than an internet connection? Never.
First, I apologise about the line endings thing. I simply cut and paste the relevant part of the logs in to a new file using Notepad++, and I've set that to save using UNIX line endings as default. My bad!
Anyway, when I came to launch the GUI today... Everything works. Hm. I was still using the latest stable version.
Fistolution, there is a beta version available, please download and test it- make sure you have the option selected to receive beta updates in the GUI settings tab.
It's just something I thought I would try on the off chance it would cure your problem.
I updated, as per Ronski's advice, to the beta version. No errors! Gah!
Yes, this is actually good, but I do find it a little annoying when things seem to fix themselves up for no apparent reason. I guess I should count my blessings.
I noticed that the beta GUI has a program versions tab (very sensible BTW). My output seems a bit concerning:
Graph6 = No version info available.
Graphpd = No version info available.
HG612 Stats Logging GUI = 2.1.5267.38646
HG612_current_stats = No version info available.
HG612_stats = No version info available.
SET_HG612_Date_and_Time = No version info available.
Could you not leave the PC switched on 24/7 for a few days to obtain a 'full' set of daily data as a monitoring baseline?
Is it possible to extract the router info using a Linux machine? I run a server locally 24/7, and it would be ideal if I can extract the logs using that machine instead. Naturally I'd be able to transfer them to my Windows PC afterwards for graphing if needed.
Failing that, I'll leave the machine on a few days to get a baseline
As you are using an older version of the modem's firmware, it might just be worth giving the updated version a shot.
I thought I was using the updated one! Oops. Do you know where I could find the latest version? And do I have to worry about BT Agent etc.?
Although a shade over 75 Mbps ain't all that bad is it?
Oh, it's marvellous. My previous connection was ADSL2+ running at 10 down, 1 up, so I certainly appreciate the difference.
I just would like to keep track of it over the coming months/years to make sure that things stay good!
Once again, thank you both for all of your time!