Had Lumia 810 and didn't recall crash. Got a Lumia 1020 for 2 weeks and crashed at least 3 times. The first two times were just not able to launch app. Power button can be used for reboot. Minutes ago, the hang was really bad that nothing responds. After holding all the keys, it still not reboot. Then I throw the phone on bed. After minutes later, it rebooted. This is the first time I have a uni-body Lumia. This is pretty frustrating as I could not remove the battery to force it reboot. A WP fan but really frustrated.