Step 2: Repair
The real fix is to repair the ribbon cable. The ribbon cable is held to the PCB with glue. Overtime, the stiff ribbon cable pulls away from the circuit board and bad connections develop.
The fix involves using your thumb to rub hard over the the ribbon cable to circuit board interface. Rub hard on both side to reestablish / reactivate the bond between the ribbon cable and circuit board.
I wish there was a better way to permanently attach the ribbon cable to the circuit board. My fear is that the ribbon cable is simply going to come loose again, overtime.