I noticed that my router is turning off its wireless (the two lights are not on), and indeed, I think the wired internet (to my local net) as well.
For example, I lose the wired connection from my Mac to my Linux server, which hosts my xmpp server.
So I tried updating the 1.08 firmware following your instructions to 1.09. I used Firefox on my Mac.
But after the update, I could no longer set the admin password (the option is gone!). Furthermore, the reset to factory settings did not work. Nor did the reboot.
I manually rebooted. 1.09 is installed. But restoring its saved settings does also not work.
Everything was totally screwed up. there was no 5GHz wifi, for example.
Then I switched to Safari, and all the options reappeared.
Also, restoring my saved settings did not seem to restore my password.
The whole update process is a real pain. Every time you do a factory reset, you have to go through the dumb router setup steps. There should be no need to connect to my-dlink account when i will just have to reset things again. One should be able to skip this and restore saved settings.