[adciv]

The reason it's probably not working is you have momentum in the system. Once the limit switch is triggered, you are telling the motor controller to stop applying power, but the momentum in the system will keep it moving for a while longer. At some point, the limit switch releases and the system no longer thinks it needs to stop.

You can also use a different method for sensing the actuator limits or ensure the limit switch is triggered even once the actuator is past the stop position.