1. Can you open and close the door manually with some effort? If not I would have a professional verify that the door is properly balanced.
2. Are all the wheels and tracks properly lubricated? If not buy some approved lubricant to reduce the amount of friction.
3. Are the door tracks properly aligned? If not, either repair it, or hire someone who can assist you.
4. Is there any ice build-up on any areas? If so clear the debris, and ensure that the gasket is not also freezing to the pad.
5. If the door opener is very old (more than 10 years) it might be time for a new motor. No need to throw it out, you simply have to replace the motor.
Regards
EVIL Teken . . .