The window goes down easier because gravity is helping. The window tracks could be dirty or the motor could be weak, causing the trouble going up.
If you are having trouble with your window going back up to the up position, I assume that it has no trouble going down. The problem may be the motor in the door being to weak to push the window back up. You can replace this for about 55.00 good luck
It means that at any moment, there is going to be trouble.
bad power window motor
IF THIS IS A POWER WINDOW THE MOTOR IS GOING BAD.IT HAS THE POWER TO PULL THE WINDOW DOWN BUT PUSHING IT UP IS MUCH HARDER FOR THE MOTOR.GEARS COULD ALSO BE THE ISSUE IN THE MOTOR IF IT MAKES A GRINDING NOISE IT IS THE GEARS,IF JUST NOT PUSHING UP THE WINDOW THE MOTOR IS JUST GOING BAD.
main switch is bad
Take door panel off... Look inside window panel while going up and down, see what is missing or broken , then replace or fix.
Check the window switch.
Because when the window is going down it is aided by gravity and the motor doesnt have to actually do anything. Whereas it has to lift the windows full weight when going up. Try greasing the runners, this may get a little more life out of the motor.
Turning the window crank in a counter clockwise direction, the window will go down, reverse direction to raise it. If you are speaking of the rear window the switch is on the a/c control panel. Down makes the window go down and up is up
You need a engine scanner and then go into transmission trouble codes. Write them down,get a book, look them up, and read. Most scanners will tell you whats going on.
If you can still here the motor for the window working, you can try making it go in the up and then down position (you should be able to feel and here it make the sound it makes when the window is going up and down.) After a few times of doing this, leave it in the down position, then gently but firmly push the window all the way down until you can almost not see the window anymore. Then, click the button to make it go up and mine works after doing that. Mine usually does that when it's really cold outside.
It sounds as if your window motor is either going out or the window regulator is binding somewhere. I have heard of people putting a good silicone spray along the window track and that sometimes helps. You will have to remove the interior door panel to get access to the window track. It is what the window slides up and down in. (the left and right side of the window.) Good luck.