Slopth
You are a person of patience who, unfortunately, is pioneering the Netgear/Humax Wireless saga. If you are willing and have the time then there are a number of steps to try and localise the problem.
As background, its seems that most wireless problems have been related to the type of wireless USB device followed by interference on particular channels and Humax's non-usage of some channels (tbc). Edimax 7711 devices seems to work satisfactorily with the HDR.
Amazon reviewers have mixed feelings about the Netgear DGN2200v3. Some have reported transmitter power losses over time and an IP Address lease time of 12 hours (unchangeable). [My BT Home Hub's lease time is 24 hours.]
If I were you I would carry out the following tests to decide whether or not my HDR or my Router was causing the problem. Checking if the problem still exists afterwards.
1. Reset the Netgear Router.
2. Reset the HDR to Default Settings and re-enter the wireless details.
3. Reload v1.02.28 and do 2. again.
4. Move the HDR closer to the Router.
5. Remove all wireless security settings from the router and do 2. again. (Disconnect other devices connected to your router to avoid unwanted penetration.)
6. Test all channels, one at a time.
7. Fix the ethernet address.
8. Replace the Netgear Router with the Thomson Router and do 2. again.
If my problem still existed then I would consider I had a good reason to pursue a warranty case. But as I know a little bit about software (and am interested in solving problems) I would load the custom software and its wireless-helper application. Then I could supply more qualified people with information to help me out.
Sorry that your problem is not easy to resolve.
Martin