ApiTakePictureActivity/cameraClient: Not using prepare camera.

12-18 01:42:02.835: W/SharedCameraLogging(577): ApiTakePictureActivity/cameraClient: Not using prepare camera.
12-18 01:42:02.843: W/CameraService(109): CameraService::connect X (pid 577) rejected (existing client).
12-18 01:42:02.859: W/dalvikvm(577): threadid=19: thread exiting with uncaught exception (group=0x40dbe1f8)
12-18 01:42:02.867: E/PriorityThreadFactory/CameraManager/cameraManipulationExecutor(577): Uncaught exception!
12-18 01:42:02.867: E/PriorityThreadFactory/CameraManager/cameraManipulationExecutor(577): java.lang.RuntimeException: java.lang.RuntimeException: Fail to connect to camera service
12-18 01:42:02.867: E/PriorityThreadFactory/CameraManager/cameraManipulationExecutor(577):     at com.google.glass.camera.CameraManager.handleError(CameraManager.java:1974)
12-18 01:42:02.867: E/PriorityThreadFactory/CameraManager/cameraManipulationExecutor(577):     at com.google.glass.camera.CameraManager.handleError(CameraManager.java:1988)
12-18 01:42:02.867: E/PriorityThreadFactory/CameraManager/cameraManipulationExecutor(577):     at com.google.glass.camera.CameraManager.acquireCameraSynchronously(CameraManager.java:892)
12-18 01:42:02.867: E/PriorityThreadFactory/CameraManager/cameraManipulationExecutor(577):     at com.google.glass.camera.CameraManager.access$2600(CameraManager.java:65)
12-18 01:42:02.867: E/PriorityThreadFactory/CameraManager/cameraManipulationExecutor(577):     at com.google.glass.camera.CameraManager$PictureRequest.onExecute(CameraManager.java:540)
12-18 01:42:02.867: E/PriorityThreadFactory/CameraManager/cameraManipulationExecutor(577):     at com.google.glass.camera.CameraManager$CameraManipulation$1.run(CameraManager.java:278)
12-18 01:42:02.867: E/PriorityThreadFactory/CameraManager/cameraManipulationExecutor(577):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
12-18 01:42:02.867: E/PriorityThreadFactory/CameraManager/cameraManipulationExecutor(577):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
12-18 01:42:02.867: E/PriorityThreadFactory/CameraManager/cameraManipulationExecutor(577):     at java.lang.Thread.run(Thread.java:856)
12-18 01:42:02.867: E/PriorityThreadFactory/CameraManager/cameraManipulationExecutor(577): Caused by: java.lang.RuntimeException: Fail to connect to camera service
12-18 01:42:02.867: E/PriorityThreadFactory/CameraManager/cameraManipulationExecutor(577):     at android.hardware.Camera.native_setup(Native Method)
12-18 01:42:02.867: E/PriorityThreadFactory/CameraManager/cameraManipulationExecutor(577):     at android.hardware.Camera.<init>(Camera.java:374)
12-18 01:42:02.867: E/PriorityThreadFactory/CameraManager/cameraManipulationExecutor(577):     at android.hardware.Camera.open(Camera.java:330)
12-18 01:42:02.867: E/PriorityThreadFactory/CameraManager/cameraManipulationExecutor(577):     at com.google.glass.camera.CameraManager.acquireCameraSynchronously(CameraManager.java:889)
12-18 01:42:02.867: E/PriorityThreadFactory/CameraManager/cameraManipulationExecutor(577):     ... 6 more
12-18 01:42:02.867: E/AndroidRuntime(577): FATAL EXCEPTION: CameraManager/cameraManipulationExecutor-0
12-18 01:42:02.867: E/AndroidRuntime(577): java.lang.RuntimeException: java.lang.RuntimeException: Fail to connect to camera service
12-18 01:42:02.867: E/AndroidRuntime(577):     at com.google.glass.camera.CameraManager.handleError(CameraManager.java:1974)
12-18 01:42:02.867: E/AndroidRuntime(577):     at com.google.glass.camera.CameraManager.handleError(CameraManager.java:1988)
12-18 01:42:02.867: E/AndroidRuntime(577):     at com.google.glass.camera.CameraManager.acquireCameraSynchronously(CameraManager.java:892)
12-18 01:42:02.867: E/AndroidRuntime(577):     at com.google.glass.camera.CameraManager.access$2600(CameraManager.java:65)
12-18 01:42:02.867: E/AndroidRuntime(577):     at com.google.glass.camera.CameraManager$PictureRequest.onExecute(CameraManager.java:540)
12-18 01:42:02.867: E/AndroidRuntime(577):     at com.google.glass.camera.CameraManager$CameraManipulation$1.run(CameraManager.java:278)
12-18 01:42:02.867: E/AndroidRuntime(577):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
12-18 01:42:02.867: E/AndroidRuntime(577):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
12-18 01:42:02.867: E/AndroidRuntime(577):     at java.lang.Thread.run(Thread.java:856)
12-18 01:42:02.867: E/AndroidRuntime(577): Caused by: java.lang.RuntimeException: Fail to connect to camera service
12-18 01:42:02.867: E/AndroidRuntime(577):     at android.hardware.Camera.native_setup(Native Method)
12-18 01:42:02.867: E/AndroidRuntime(577):     at android.hardware.Camera.<init>(Camera.java:374)
12-18 01:42:02.867: E/AndroidRuntime(577):     at android.hardware.Camera.open(Camera.java:330)
12-18 01:42:02.867: E/AndroidRuntime(577):     at com.google.glass.camera.CameraManager.acquireCameraSynchronously(CameraManager.java:889)
12-18 01:42:02.867: E/AndroidRuntime(577):     ... 6 more
12-18 01:42:02.875: W/ActivityManager(220):   Force finishing activity com.google.glass.camera/.ApiTakePictureActivity

先ほどに引き続き、似たようなスタックトレース。
いまのところ、原因不明。