Debbie, you have already tried the adjustments

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I would have recommended. my first guess at your problem is tha the sensitivity was out of adjustment (i.e. +/- on the back of the unit). this set how much torque the drive electronics will allow the motor to deliver to overcome friction due to whatever. The open/close adjustments on the side of the unit, my guess, determine where the motor shuts off when reaching full open or full close. last thing to check is when the door closes only half way does the motor shut off. if so ,,,it must be thinking you have reached closed ...or it is binding there. but seeems you have proven that this is not the problem. I am out of ideas to check. others may be more helpful. good luck. LJ