WHoa!
I've just had a disconnection for some reason. The reason I expect I shall never know, but my HG612 was still in sync, unchanged speeds, so it wasn't that.
The Internet light on my router had gone out, so in the GUI I disconnected it (it was showing connected), and reconnected.
I got a 172.20.xx.xx IP address rather than my expected Static IP address!
Powered it off, waited a bit. Powered on. Just the same.
Powered off, then powered off the HG612. Waited 30 seconds and repowered the HG612. Waited till that finally had sync - as the Lan1 light does go steady early on, then start a second phase of rapid flickering before finally stabilising.
Powered up my router and got my expected static IP address.
I don't know if that may help, but have you tried that exact sequence? Particularly not reacting to the first steadying of the Lan1 light.
The indispensable man or woman passes from the scene, and what happens next is more or less the same thing as was happening before.
My broadband basic info/help site -
www.robertos.me.uk. Domains, site and mail hosting -
Tsohost.
Connection -
Plusnet UnLim Fibre (FTTC). Sync 57676/14040kbps @ 600m. -
BQM