`It could be, the hazard switch connects the flasher can in the rear to the left and right indicators. The switch could be faulty or it could be the the connector.
Try disconnecting the rear flasher can, turn on the right indicator and turn on Hazard switch ( it will connect the left flashers if the switch is working) if it doesnt work, then a trip to Honda for a new switch is in order.
If you are felling game, you could open the switch (its not difficult) and try cleaning and lubricating the contacts.