kinect2 Service call failed ,roslaunch kinect2_bridge kinect2_bridge.launch

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hello，I am a studnet . I recently learning ROS,I use kinectv2 . but sometimes I can not start kinectv2 because some reasome.

roslaunch kinect2_bridge kinect2_bridge.launch

It's alway :

1. List item[ INFO] [1453219160.622347895]: [Kinect2Bridge::initDevice] Kinect2 devices found: [Info] [Freenect2DeviceImpl] opening... [Info] [Freenect2DeviceImpl] opened [Info] [Freenect2DeviceImpl] starting... [Info] [Freenect2DeviceImpl] enabling usb transfer submission... [Info] [Freenect2DeviceImpl] submitting usb transfers... [Info] [Freenect2DeviceImpl] started [Info] [Freenect2DeviceImpl] stopping... [Info] [Freenect2DeviceImpl] disabling usb transfer submission... [Info] [Freenect2DeviceImpl] canceling usb transfers... [Info] [Freenect2DeviceImpl] stopped nodelet: /usr/include/eigen3/Eigen/src/Core/DenseStorage.h:78: Eigen::internal::plain_array<t, size,="" matrixorarrayoptions,="" 16="">::plain_array() [with T = double; int Size = 16; int MatrixOrArrayOptions = 0]: Assertion `(reinterpret_cast<size_t>(eigen_unaligned_array_assert_workaround_gcc47(array)) & 0xf) == 0 && "this assertion is explained here: " "http://eigen.tuxfamily.org/dox-devel/group__TopicUnalignedArrayAssert.html" " * READ THIS WEB PAGE !!! *"' failed. [kinect2-1] process has died [pid 28527, exit code -6, cmd /opt/ros/indigo/lib/nodelet/nodelet manager __name:=kinect2 __log:=/home/exbot/.ros/log/f81d454c-bea8-11e5-bf34-74d43571568e/kinect2-1.log]. log file: /home/exbot/.ros/log/f81d454c-bea8-11e5-bf34-74d43571568e/kinect2-1.log [kinect2_bridge-2] process has died [pid 28555, exit code 255, cmd /opt/ros/indigo/lib/nodelet/nodelet load kinect2_bridge/kinect2_bridge_nodelet kinect2 __name:=kinect2_bridge __log:=/home/exbot/.ros/log/f81d454c-bea8-11e5-bf34-74d43571568e/kinect2_bridge-2.log]. log file: /home/exbot/.ros/log/f81d454c-bea8-11e5-bf34-74d43571568e/kinect2_bridge-2.log [kinect2_points_xyzrgb_qhd-4] process has died [pid 28599, exit code 255, cmd /opt/ros/indigo/lib/nodelet/nodelet load depth_image_proc/point_cloud_xyzrgb kinect2 rgb/camera_info:=kinect2/qhd/camera_info rgb/image_rect_color:=kinect2/qhd/image_color_rect depth_registered/image_rect:=kinect2/qhd/image_depth_rect depth_registered/points:=kinect2/qhd/points __name:=kinect2_points_xyzrgb_qhd __log:=/home/exbot/.ros/log/f81d454c-bea8-11e5-bf34-74d43571568e/kinect2_points_xyzrgb_qhd-4.log]. log file: /home/exbot/.ros/log/f81d454c-bea8-11e5-bf34-74d43571568e/kinect2_points_xyzrgb_qhd-4.log [kinect2_points_xyzrgb_hd-5] process has died [pid 28672, exit code 255, cmd /opt/ros/indigo/lib/nodelet/nodelet load depth_image_proc/point_cloud_xyzrgb kinect2 rgb/camera_info:=kinect2/hd/camera_info rgb/image_rect_color:=kinect2/hd/image_color_rect depth_registered/image_rect:=kinect2/hd/image_depth_rect depth_registered/points:=kinect2/hd/points __name:=kinect2_points_xyzrgb_hd __log:=/home/exbot/.ros/log/f81d454c-bea8-11e5-bf34-74d43571568e/kinect2_points_xyzrgb_hd-5.log]. log file: /home/exbot/.ros/log/f81d454c-bea8-11e5-bf34-74d43571568e/kinect2_points_xyzrgb_hd-5.log [kinect2_bridge-2] restarting process process[kinect2_bridge-2]: started with pid [28762] [kinect2_points_xyzrgb_qhd-4] restarting process process[kinect2_points_xyzrgb_qhd-4]: started with pid [28763] [kinect2_points_xyzrgb_hd-5] restarting process process[kinect2_points_xyzrgb_hd-5]: started with pid [28764] [kinect2_points_xyzrgb_sd-3] process has died [pid 28571, exit code 255, cmd /opt/ros/indigo/lib/nodelet/nodelet load depth_image_proc/point_cloud_xyzrgb kinect2 rgb/camera_info:=kinect2/sd/camera_info rgb/image_rect_color:=kinect2/sd/image_color_rect depth_registered/image_rect:=kinect2/sd/image_depth_rect depth_registered/points:=kinect2/sd/points __name:=kinect2_points_xyzrgb_sd __log:=/home/exbot/.ros/log/f81d454c-bea8-11e5-bf34-74d43571568e/kinect2_points_xyzrgb_sd-3.log]. log file: /home/exbot/.ros/log/f81d454c-bea8-11e5-bf34-74d43571568e/kinect2_points_xyzrgb_sd-3*.log [kinect2_points_xyzrgb_sd-3] restarting process

But sometimes the normal start，kinect2 intact， ./bin/Protonect can open kinect2

How can I solve this problem，Thanks.