I am experiencing a different flaw as well. Facebook will not update it's news feed on either 4G or WiFi while docked. However it will work just fine in phone mode. Had anybody else experienced this?
Sent from my ASUS PadFone X using XDA Free mobile app
I changed my lock screen options to disable app shortcuts and enable lock screen widgets. When docking the phone from a locked state the system UI will repeatedly crash in tablet mode. To get past this I unlocked my phone before I docked it. After reversing my changes the device works again just fine.