Hello, new sp4(i5/128GB/4GB) owner. So far I'm mixed. I've had to restart a few times in order to get an app or to get the start menu to open. Anybody else have issues with the apps or start button showing you pressed them, but do nothing. I'm wondering if I have a defective unit? What do you guys suggest, should I take it back, or is this a know issue that will be fixed in an update?