My Old Lumia 920 used to just shutdown some times, i had to do a soft reset to switch on my phone, surprisingly in the night when i am charging not using it, Drive + Beta was having issues too, just used to get struck, some times doesn't show my location, it used to get warm when i am charging, i did a warranty exchange, i had new lumia 920 for over 3 weeks now & no issues what so ever. unfortunately i did a warranty exchange with in 30 days i still got a refurbished phone. So YES some phones do have quality issues, but if they are working fine they are great phones. Still not thrilled with still photos though cant take sharp photos, great videos for sure.