It may be that the channels are sticking and if so try spraying them with some silicone grease..
Other than that you may need to reset the system. If so this is the system

Remember that you must do this reset from the passenger side window control ( not the drivers side)

1. Turn the ignition to ON(ll)
2. Lower the window all the way down with the window switch.
3. Open the front passenger's door.
Note: Do steps four through to seven within five seconds of each other. DO these steps a total of four times in a row. These steps clear the control unit memory.

4. Turn the ignition switch to lock(0)
5. Push down and hold the power window switch.
6. Turn the ignition switch to on (ll)
7. Release the power window switch.
Note: Make sure the auto-up feature doesn't work. If it does, repeat steps four thru seven again, paying close attention to the five second time limit for up to three more times for each series steps.
8. Lower the window all the way down with the power window switch.
9. Pull up and hold the power window switch until the window goes all the way up, then keep holding the switch for 1 second.
Note: Make sure the auto-up/down feature works correctly by lowering and raising the window with the power window switch. If it doesn't work correctly, repeat the manual reset several times, paying close attention to the five seconds time limit.