From your message, we couldn’t know what problem you’ve had with current installed actuator.
We wonder why the Actuator Installed and Operates without Fully Closed Top Cover to Actuator Base.
If you keep open the Top Cover and operating the Actuator continuously, dust comes into Actuator Main Body and Condensing then it can be out of order within a short time.
We’d like to recommend you to make fully close the Top Cover of Actuator properly and Operate it.