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After watching you video and listening to your girls I think that they want out not just sometimes, but always to enjoy the green grass etc. They are complaining and looking for a way out.

This might be the so called "egg-song" when they call for the rooster to lead them back to the group after laying the egg. Have you taken a look in the nest box when these calls occur? You could make a video, upload it to YouT*ube or similar platform and provide a link for us to see exactly...