No solution but interesting.
Factory resetting the HG612 does not remove the flashing. Merely sets that back to as downloaded if you have altered anything.
Assuming you have the correct flashed version there is nothing wrong with it, but any consumer grade modem can go bonkers and need a factory reset which works when all else has failed.
Connection - AAISP Home::1 80/20. Sync 63086/13719Kbps @ 600m. BQMs - IPv4 & IPv6
Edited by RobertoS (Wed 10-May-17 10:53:45)