title: Bluetooth keeps disconnecting after being connected to another Android device for a while
body: <p>I have an Xperia Z3C, Android 5.1.1 and I'm trying to connect it to a Nexus 4 Android 6.0.1 via Bluetooth. Pairing them is OK, but when I try to connect them, it says 'Connected' for less than a second and automatically disconnects.</p>
  
  <p>Is this a known issue? I haven't found anything about this.</p>
  
  <p>Here's what logcat says:</p>
  
  <pre><code>03-14 17:25:55.308: E/bt-btif(14245): bte_scan_filt_param_cfg_evt, 1
  03-14 17:25:55.308: E/bt-btif(14245): bte_scan_filt_param_cfg_evt, 1
  03-14 17:25:55.990: E/bt-btm(14245): new address: xx:xx:xx:xx:xx:xx
  03-14 17:25:55.990: E/bt-btm(14245): new address: xx:xx:xx:xx:xx:xx
  03-14 17:25:56.712: E/bt-btm(14245): new address: xx:xx:xx:xx:xx:xx
  03-14 17:25:57.464: E/bt-btif(14245): bte_scan_filt_param_cfg_evt, 1
  03-14 17:25:57.814: E/bt-btm(14245): Ignoring RNR as the state is not BTM_SEC_STATE_GETTING_NAME
  03-14 17:25:57.933: E/NetlinkEvent(318): Unknown ifindex 41 in RTM_DELADDR
  03-14 17:25:57.963: E/dhcpcd(15974): bt-pan: interface not found or invalid
  03-14 17:25:57.986: E/BluetoothPanServiceJni(14245): ## ERROR : disconnectPanNative(L224): Failed disconnect pan channel, status: 1##
  03-14 17:25:58.139: E/BluetoothTetheringNetworkFactory(14245): DHCP request error:DHCP result was failed
  03-14 17:26:01.382: E/bt-btm(14245): btm_sec_disconnected - Clearing Pending flag
  </code></pre>