场景1：手机刚刚重启完，运行APP与BLE设备通信，正常无问题（任何情况）
场景2：中断当前BLE操作，退出APP，然后重新与BLE设备通信，一旦把APP切换到后台并黑屏，APP会在几秒内崩溃，logcat没任何错误输出
求大神解答，跪求，以下是捕抓的bug输出（bugly也抓不到），但是重启手机后第一次正常操作，往后就一直会出现描述的问题
04-18 17:58:03.578 2971-3014/? E/BluetoothServiceJni: An exception was thrown by callback 'btgattc_notify_cb'.
04-18 17:58:03.578 2971-3014/? E/BluetoothServiceJni: android.os.DeadObjectException
at android.os.BinderProxy.transact(Native Method)
at android.bluetooth.IBluetoothGattCallback$Stub$Proxy.onNotify(IBluetoothGattCallback.java:835)
at com.android.bluetooth.gatt.GattService.onNotify(GattService.java:724)
at dalvik.system.NativeStart.run(Native Method)
04-18 17:58:03.578 2971-3014/? D/BtGatt.btif: btif_gattc_upstreams_evt: Event 10
04-18 17:58:03.578 2971-3014/? E/bt-btif: HAL bt_gatt_callbacks->client->notify_cb
04-18 17:58:03.578 2971-3014/? D/BtGatt.GattService: onNotify() - address=F0:C7:7F:73:68:20, charUuid=0000ffb2-0000-1000-8000-00805f9b34fb, length=19
04-18 17:58:03.578 2971-3014/? E/BluetoothServiceJni: An exception was thrown by callback 'btgattc_notify_cb'.
04-18 17:58:03.578 2971-3014/? E/BluetoothServiceJni: android.os.DeadObjectException
at android.os.BinderProxy.transact(Native Method)
at android.bluetooth.IBluetoothGattCallback$Stub$Proxy.onNotify(IBluetoothGattCallback.java:835)
at com.android.bluetooth.gatt.GattService.onNotify(GattService.java:724)
at dalvik.system.NativeStart.run(Native Method)
04-18 17:58:03.578 2971-2982/? D/BtGatt.GattService: Binder is dead - unregistering client (6)!
04-18 17:58:03.578 2971-2982/? D/BtGatt.GattService: stopScan() - queue=0
04-18 17:58:03.578 2971-2982/? D/BtGatt.GattService: stopScan() - queue empty; stopping scan
04-18 17:58:03.578 2971-2982/? D/BtGatt.btif: btif_gattc_scan
04-18 17:58:03.578 2971-2982/? D/BtGatt.GattService: unregisterClient() - clientIf=6
04-18 17:58:03.578 2971-2982/? D/BtGatt.btif: btif_gattc_unregister_app
04-18 17:58:03.578 2971-3014/? D/BtGatt.btif: btgattc_handle_event: Event 1003
04-18 17:58:03.578 2971-3014/? D/BtGatt.btif: btgattc_handle_event: Event 1001
04-18 17:58:03.578 2971-3088/? W/bt-l2cap: L2CA_RemoveFixedChnl() CID: 0x0004 BDA: f0c77f736820 not connected
04-18 17:58:03.578 1156-1539/? D/KeyguardViewMediator: setHidden false
04-18 17:58:03.578 1156-1539/? D/KeyguardUpdateMonitor: sendKeyguardVisibilityChanged(true)
04-18 17:58:03.578 1156-1156/? D/KeyguardUpdateMonitor: handleKeyguardVisibilityChanged(1)
04-18 17:58:03.578 2971-3014/? D/BtGatt.btif: btif_gattc_upstreams_evt: Event 5
04-18 17:58:03.578 2971-3014/? E/bt-btif: HAL bt_gatt_callbacks->client->close_cb
04-18 17:58:03.578 2971-3014/? D/BtGatt.GattService: onDisconnected() - clientIf=6, connId=6, address=F0:C7:7F:73:68:20
04-18 17:58:03.578 2971-3014/? E/BtGatt.ContextMap: Context not found for ID 6
