2015 Hyundai Tucson - Window switch issue

Front driver window switch works on all windows to go up and down except rear window passenger side which goes down only. I have to go into the backseat and use that window switch to raise it back up. What could be the possible problem?

i think theres a problem with the master switch on the drivers door. the switch for the rear pass. side window on the master switch is starting to fail.
the window master switch is all the switches on the drivers door. it usually has to be replaced as one whole unit.