I've been following this guide closely and just completed the final steps of mounting the door lock onto my door.
Everything was working properly until about 5 hours into use when the actuator stopped moving and started clicking quietly. I encountered this issue before when putting together the project and it happened because of a power issue. As of now, I have the linear actuator powered through the 5V pin of the Arduino Uno and the GND pin connected to ground of the actuator. I'm using a 9V Duracell battery to power the Arduino.
Any suggestions are greatly appreciated.