Camera in air keeps drifting

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I've added a camera to the simulation. Its gravity is disabled & it also doesn't touch the ground. But it keeps drifting right after inserting. Video of the problem is uploaded here.

I tried 1, 10, 100 for the mass & 1, 10, 100 for the inertias. But they don't seem to affect the drifting. Any help is greatly appreciated.

This is the sdf file of the camera:

<?xml version="1.0" ?>
<sdf version="1.5">
  <model name="camera">
  <pose>0 0 0.5 0 0 0 </pose> <!--1.5707963267948966 1.5707963267948966</pose-->
    <static>0</static>
    <link name="link">
      <gravity>0</gravity>
      <inertial>
        <mass>10.1</mass>
        <inertia>
          <ixx>1.000166667</ixx>
          <iyy>1.000166667</iyy>
          <izz>1.000166667</izz>
        </inertia>
      </inertial>
      <collision name="collision">
        <geometry>
          <box>
            <size>0.1 0.1 0.1</size>
          </box>
        </geometry>
      </collision>
      <visual name="visual">
        <geometry>
          <box>
            <size>0.1 0.1 0.1</size>
          </box>
        </geometry>
      </visual>
      <sensor name="camera" type="camera">
        <camera>
          <horizontal_fov>1.047</horizontal_fov>
          <image>
            <width>320</width>
            <height>240</height>
          </image>
          <clip>
            <near>0.1</near>
            <far>100</far>
          </clip>
        </camera>
        <always_on>1</always_on>
        <update_rate>30</update_rate>
        <visualize>true</visualize>
        <plugin name="camera_controller" filename="libgazebo_ros_camera.so">
          <alwaysOn>true</alwaysOn>
          <updateRate>0.0</updateRate>
          <cameraName>free_camera</cameraName>
          <imageTopicName>/free_camera/image_raw</imageTopicName>
          <cameraInfoTopicName>/free_camera/camera_info</cameraInfoTopicName>
          <frameName>camera_link</frameName>
          <hackBaseline>0.07</hackBaseline>
          <distortionK1>0.0</distortionK1>
          <distortionK2>0.0</distortionK2>
          <distortionK3>0.0</distortionK3>
          <distortionT1>0.0</distortionT1>
          <distortionT2>0.0</distortionT2>
        </plugin>
      </sensor>
    </link>
  </model>
</sdf>