[Xposed Framework Modules] trunzoc:
Same for me. All media apps cause a reboot if you hit the volume keys while they are running. Doesn't matter if they are in the foreground or not.

Give me a sec to grab a logcat

***EDIT***

[ 09-19 14:11:02.482 14939:15078 D/InputReader ]Input event: value=1 when=706600258000
[ 09-19 14:11:02.632 14939:15077 I/InputDispatcher ]Delivering key to current input target: action: 0x0
[ 09-19 14:11:02.662 14939:15117 I/AudioService ]isMediaSilentMode false
[ 09-19 14:11:02.662 14939:15017 D/VolumePanel ]change volume by MSG_VOLUME_CHANGED
[ 09-19 14:11:02.662 14939:15017 D/VolumePanel ]onVolumeChanged(streamType: 3, flags: 17)
[ 09-19 14:11:02.662 14939:15017 D/ExtSeekBar ]setProgress = 2
[ 09-19 14:11:02.662 14939:15017 D/ProgressBar ]setProgress = 2
[ 09-19 14:11:02.672 14939:15017 D/ExtSeekBar ]setProgress = 2, fromUser = false, isEnableChangeColor() = false
[ 09-19 14:11:02.672 14939:15017 D/ProgressBar ]setProgress = 2, fromUser = false
[ 09-19 14:11:02.672 14939:15017 D/ProgressBar ]mProgress = 0mIndeterminate = false, mMin = 0, mMax = 15
[ 09-19 14:11:02.672 14939:15017 D/ExtSeekBar ]updateDrawable this.mThumb = null, msetDrawable = android.graphics.drawable.LayerDrawable@42ab0e80, mOffsetThumb = -1
[ 09-19 14:11:02.672 14939:15017 D/ExtSeekBar ]updateDrawable getProgress() = 2, getMax() = 15GeneralUtil.isTablet() = false
[ 09-19 14:11:02.672 14939:15017 D/ProgressBar ]setProgressDrawable mProgressDrawable = android.graphics.drawable.LayerDrawable@42ab0e80, d = android.graphics.drawable.LayerDrawable@42ab0e80needUpdate = false
[ 09-19 14:11:02.672 14939:15017 D/ProgressBar ]setProgressDrawable drawableHeight = 36
[ 09-19 14:11:02.672 14939:15017 D/ExtSeekBar ]setProgress = 0
[ 09-19 14:11:02.672 14939:15017 D/ProgressBar ]setProgress = 0
[ 09-19 14:11:02.672 14939:15017 D/ExtSeekBar ]setProgress = 0, fromUser = false, isEnableChangeColor() = false
[ 09-19 14:11:02.672 14939:15017 D/ProgressBar ]setProgress = 0, fromUser = false
[ 09-19 14:11:02.672 14939:15017 D/ProgressBar ]mProgress = 0mIndeterminate = false, mMin = 0, mMax = 7
[ 09-19 14:11:02.672 14939:15017 D/ExtSeekBar ]updateDrawable this.mThumb = null, msetDrawable = android.graphics.drawable.LayerDrawable@42c08170, mOffsetThumb = -1
[ 09-19 14:11:02.672 14939:15017 D/ExtSeekBar ]updateDrawable getProgress() = 0, getMax() = 7GeneralUtil.isTablet() = false
[ 09-19 14:11:02.672 14939:15017 D/ProgressBar ]setProgressDrawable mProgressDrawable = android.graphics.drawable.LayerDrawable@42c08170, d = android.graphics.drawable.LayerDrawable@42c08170needUpdate = false
[ 09-19 14:11:02.682 14939:15017 D/ProgressBar ]setProgressDrawable drawableHeight = 36
[ 09-19 14:11:02.682 14939:15017 D/VolumePanel ]addOtherVolumes stream : STREAM_RING
[ 09-19 14:11:02.682 14939:15017 W/dalvikvm ]threadid=17: thread exiting with uncaught exception (group=0x41a577c0)
[ 09-19 14:11:02.682 14939:15017 E/AndroidRuntime ]!@*** FATAL EXCEPTION IN SYSTEM PROCESS: android.server.ServerThread
java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
at android.view.ViewGroup.addViewInner(ViewGroup.java:3603)
at android.view.ViewGroup.addView(ViewGroup.java:3474)
at android.view.ViewGroup.addView(ViewGroup.java:3419)
at android.view.ViewGroup.addView(ViewGroup.java:3395)
at android.view.VolumePanel.addOtherVolumes(VolumePanel.java:719)
at android.view.VolumePanel.reorderSliders(VolumePanel.java:676)
at android.view.VolumePanel.onVolumeChanged(VolumePanel.java:1042)
at android.view.VolumePanel.handleMessage(VolumePanel.java:1485)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at com.android.server.ServerThread.run(SystemServer.java:1570)
at de.robv.android.xposed.XposedBridge.invokeOriginalMethodNative(Native Method)
at de.robv.android.xposed.XposedBridge.invokeOriginalMethod(XposedBridge.java:640)
at de.robv.android.xposed.XposedBridge.handleHookedMethod(XposedBridge.java:471)
at com.android.server.ServerThread.run(Native Method)
[ 09-19 14:11:02.692 18250:18250 I/dumpstate ]begin
[ 09-19 14:11:02.712 14939:15078 D/InputReader ]Input event: value=0 when=706830666000
[ 09-19 14:11:02.712 14939:15077 I/InputDispatcher ]Delivering key to current input target: action: 0x1
[ 09-19 14:11:02.992 14939:15017 E/android.os.Debug ]!@Dumpstate > sdumpstate -k -t -z -d -o /data/log/dumpstate_sys_error
getCurrentPosition
[ 09-19 14:11:04.194 14697:18173 I/AudioPlayer ]fillBuffer() delay (173828) us > 100000 us, request_size (572)