[Xposed Framework Modules] C3C076:
1) Regarding SystemUI crash. In logcat I can see errors when SystemUIService is starting which are not GB related but Xposed framework related. This should not happen and you should probably try contacting rovo89 - the dev of Xposed framework with this error to get more info.

Maybe it's a bug that needs to be addressed at xposed framework level. Here's the logcat you should post in his thread.

I believe, that this error will happen even if you disable GravityBox module in Xposed installer. You can check that before posting to Xposed framework thread. If crash stops after deactivating GB the only think I can think of is that you didabled navigation bar in GB Pie controls and changes made by your vendor are not accounting for state when navbar is disabled and still try to call some navbar related functionality

09-01 08:18:37.119 4645 4645 E AndroidRuntime: FATAL EXCEPTION: main
09-01 08:18:37.119 4645 4645 E AndroidRuntime: java.lang.RuntimeException: Unable to create service com.android.systemui.SystemUIService: java.lang.NullPointerException
09-01 08:18:37.119 4645 4645 E AndroidRuntime:	at android.app.ActivityThread.handleCreateService(ActivityThread.java:2569)
09-01 08:18:37.119 4645 4645 E AndroidRuntime:	at android.app.ActivityThread.access$1600(ActivityThread.java:148)
09-01 08:18:37.119 4645 4645 E AndroidRuntime:	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1333)
09-01 08:18:37.119 4645 4645 E AndroidRuntime:	at android.os.Handler.dispatchMessage(Handler.java:99)
09-01 08:18:37.119 4645 4645 E AndroidRuntime:	at android.os.Looper.loop(Looper.java:137)
09-01 08:18:37.119 4645 4645 E AndroidRuntime:	at android.app.ActivityThread.main(ActivityThread.java:5167)
09-01 08:18:37.119 4645 4645 E AndroidRuntime:	at java.lang.reflect.Method.invokeNative(Native Method)
09-01 08:18:37.119 4645 4645 E AndroidRuntime:	at java.lang.reflect.Method.invoke(Method.java:511)
09-01 08:18:37.119 4645 4645 E AndroidRuntime:	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
09-01 08:18:37.119 4645 4645 E AndroidRuntime:	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
09-01 08:18:37.119 4645 4645 E AndroidRuntime:	at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:112)
09-01 08:18:37.119 4645 4645 E AndroidRuntime:	at dalvik.system.NativeStart.main(Native Method)
09-01 08:18:37.119 4645 4645 E AndroidRuntime: Caused by: java.lang.NullPointerException
09-01 08:18:37.119 4645 4645 E AndroidRuntime:	at com.android.systemui.statusbar.phone.PhoneStatusBar.setNavBarBackgroundColor(PhoneStatusBar.java:2898)
09-01 08:18:37.119 4645 4645 E AndroidRuntime:	at com.android.systemui.statusbar.phone.PhoneStatusBar.updateNavBarTransparent(PhoneStatusBar.java:2893)
09-01 08:18:37.119 4645 4645 E AndroidRuntime:	at com.android.systemui.statusbar.phone.PhoneStatusBar.setSystemUiVisibility(PhoneStatusBar.java:2115)
09-01 08:18:37.119 4645 4645 E AndroidRuntime:	at com.android.systemui.statusbar.BaseStatusBar.start(BaseStatusBar.java:224)
09-01 08:18:37.119 4645 4645 E AndroidRuntime:	at de.robv.android.xposed.XposedBridge.invokeOriginalMethodNative(Native Method)
09-01 08:18:37.119 4645 4645 E AndroidRuntime:	at de.robv.android.xposed.XposedBridge.invokeOriginalMethod(XposedBridge.java:640)
09-01 08:18:37.119 4645 4645 E AndroidRuntime:	at de.robv.android.xposed.XposedBridge.handleHookedMethod(XposedBridge.java:471)
09-01 08:18:37.119 4645 4645 E AndroidRuntime:	at com.android.systemui.statusbar.BaseStatusBar.start(Native Method)
09-01 08:18:37.119 4645 4645 E AndroidRuntime:	at com.android.systemui.statusbar.phone.PhoneStatusBar.start(PhoneStatusBar.java:400)
09-01 08:18:37.119 4645 4645 E AndroidRuntime:	at com.android.systemui.SystemUIService.onCreate(SystemUIService.java:99)
09-01 08:18:37.119 4645 4645 E AndroidRuntime:	at android.app.ActivityThread.handleCreateService(ActivityThread.java:2559)
09-01 08:18:37.119 4645 4645 E AndroidRuntime:	... 11 more

2) In debug.log I can see one strange error related to PhoneWindowManager. Looks like your device has something special that is not in AOSP and has been added by your device vendor. Unfortunatelly, this is something I can't address. Your ROM probably diverts too much from AOSP.

To be concrete: com.android.internal.policy.impl.PhoneWindowManagerWithPartialDisplay

This class is new and is used instead of default PhoneWindowManager and is probably heavily modified by your device vendor.

Note, that this error is not related to SystemUI crash, but can have other undesired side-effects and can even cause reboots.