Bicopter Yaw is decreasing over time

Hello All,
We have been building this bicopter since quite a while now. It is giving too much pendulum like oscillations in pitch. When I see the logs, yaw is also decreasing over time. I am attaching logs, please guide what we can do to make the yaw and pitch stable. log_152_2024-3-3-12-49-30.ulg - Google Drive

P.S: I have restricted servo motions in the actuators just as shown in this picture