Has anybody else had the issue where you're using your SP4 as a tablet, then decide to switch it to laptop mode and unfold the cover out to reveal the keyboard and touchpad, but upon doing this, the touchpad is unresponsive? I can be surfing the web and get to a page with a lot of text fields to fill in so I decide the keyboard will be nicer than the on-screen keyboard. But when I pull it out I cannot use the touch pad. If I disconnect the type cover and reconnect it, then it starts working. Any ideas?