[Nexus 6 Android Development] nitin.chobhe:
Was this a clean install? Are you using any mods?

I see 2 relevant exceptions in the log (among many):

This one coming from RememBear

--------- beginning of crash
02-27 09:26:17.795 2842 2842 E AndroidRuntime: FATAL EXCEPTION: main
02-27 09:26:17.795 2842 2842 E AndroidRuntime: Process: com.remembear.android, PID: 2842
02-27 09:26:17.795 2842 2842 E AndroidRuntime: java.lang.NullPointerException: Attempt to read from field 'com.remembear.android.database.KeyringDao com.remembear.android.database.d.j' on a null object reference
02-27 09:26:17.795 2842 2842 E AndroidRuntime:	at com.remembear.android.database.i.b(KeyringTableHelper.java:3093)
02-27 09:26:17.795 2842 2842 E AndroidRuntime:	at com.remembear.android.j.q.a(UnlockPresenter.java:1222)
02-27 09:26:17.795 2842 2842 E AndroidRuntime:	at com.remembear.android.views.UnlockView.d(UnlockView.java:25121)
02-27 09:26:17.795 2842 2842 E AndroidRuntime:	at com.remembear.android.views.RemembearUnlockMasterPasswordInput$1.onClick(RemembearUnlockMasterPasswordInput.java:34)
02-27 09:26:17.795 2842 2842 E AndroidRuntime:	at android.view.View.performClick(View.java:6294)
02-27 09:26:17.795 2842 2842 E AndroidRuntime:	at android.view.View$PerformClick.run(View.java:24770)
02-27 09:26:17.795 2842 2842 E AndroidRuntime:	at android.os.Handler.handleCallback(Handler.java:790)
02-27 09:26:17.795 2842 2842 E AndroidRuntime:	at android.os.Handler.dispatchMessage(Handler.java:99)
02-27 09:26:17.795 2842 2842 E AndroidRuntime:	at android.os.Looper.loop(Looper.java:164)
02-27 09:26:17.795 2842 2842 E AndroidRuntime:	at android.app.ActivityThread.main(ActivityThread.java:6494)
02-27 09:26:17.795 2842 2842 E AndroidRuntime:	at java.lang.reflect.Method.invoke(Native Method)
02-27 09:26:17.795 2842 2842 E AndroidRuntime:	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:440)
02-27 09:26:17.795 2842 2842 E AndroidRuntime:	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)

and

02-27 16:05:00.147 18684 18684 E AndroidRuntime: FATAL EXCEPTION: main
02-27 16:05:00.147 18684 18684 E AndroidRuntime: Process: com.whatsapp, PID: 18684
02-27 16:05:00.147 18684 18684 E AndroidRuntime: android.database.CursorIndexOutOfBoundsException: Index 35 requested, with a size of 35
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.database.AbstractCursor.checkPosition(AbstractCursor.java:468)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.database.AbstractWindowedCursor.checkPosition(AbstractWindowedCursor.java:136)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:50)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at com.whatsapp.data.o.a(:182635)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at com.whatsapp.data.ar.a(:172658)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at com.whatsapp.Conversation$f.a(:114563)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at com.whatsapp.Conversation$41.onScroll(:114237)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.widget.AbsListView.invokeOnItemScrollListener(AbsListView.java:1476)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.widget.ListView.layoutChildren(ListView.java:1958)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.widget.AbsListView.onLayout(AbsListView.java:2164)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at com.whatsapp.ConversationListView.onLayout(:117893)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.view.View.layout(View.java:19659)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.view.ViewGroup.layout(ViewGroup.java:6075)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1083)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at com.whatsapp.EmojiPopupLayout.onLayout(:122210)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.view.View.layout(View.java:19659)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.view.ViewGroup.layout(ViewGroup.java:6075)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1791)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1635)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.widget.LinearLayout.onLayout(LinearLayout.java:1544)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.view.View.layout(View.java:19659)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.view.ViewGroup.layout(ViewGroup.java:6075)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.view.View.layout(View.java:19659)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.view.ViewGroup.layout(ViewGroup.java:6075)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.view.View.layout(View.java:19659)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.view.ViewGroup.layout(ViewGroup.java:6075)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.view.View.layout(View.java:19659)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.view.ViewGroup.layout(ViewGroup.java:6075)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1791)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1635)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.widget.LinearLayout.onLayout(LinearLayout.java:1544)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.view.View.layout(View.java:19659)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.view.ViewGroup.layout(ViewGroup.java:6075)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at com.android.internal.policy.DecorView.onLayout(DecorView.java:761)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.view.View.layout(View.java:19659)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.view.ViewGroup.layout(ViewGroup.java:6075)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2496)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2212)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1392)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6752)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.view.Choreographer$CallbackRecord.run(Choreographer.java:911)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.view.Choreographer.doCallbacks(Choreographer.java:723)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.view.Choreographer.doFrame(Choreographer.java:658)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:897)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.os.Handler.handleCallback(Handler.java:790)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.os.Handler.dispatchMessage(Handler.java:99)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.os.Looper.loop(Looper.java:164)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at android.app.ActivityThread.main(ActivityThread.java:6494)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at java.lang.reflect.Method.invoke(Native Method)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:440)
02-27 16:05:00.147 18684 18684 E AndroidRuntime:	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)

I'm not sure though if these are responsible for reboots.

Nitin