Nighthawk MR1100 reboots randomly

Since the new firmware upgrade to 12.06.08 I am experiencing similar behavior.  I am running without battery with the Anker plug and prior to the update it ran for weeks if not months on end.  Since the update it has been rebooting every couple days.  And rebooting is not really the correct term.  It is just shutting down and requires the power cable to be disconnected and then reconnected.  I am going to put the battery in with the old charger and see if that helps.  Very annoying as I use this at a cabin an hour away which makes getting it reconnected a chore.