Yeah this is troubling. I've been with a virtually problem free Galaxy Nexus and then the Nexus 4, and I may have made a mistake because I wanted to try the (at&t carrier bloat filled) Galaxy S4. The only reason I wanted to try it was for the 32 gigs as the Nexus phones just haven't had enough storage for me. But I've only had this S4 for 8 days and it has already shut off on me 3 times now. Today was the third time while I was sleeping, and since I use my phone as my alarm clock, this is a no go for me. I need to have my phone consistently working- especially when I need it as an alarm to wake up. I forget before I went to all Nexus these are little things that I would experience with other Android phones. I think when skins are put on top of Android, it gets messed around with by adding unnecessary carrier software & their apps, unnecessary features etc, it just comes out buggy no matter how nice they try to make it. I had an HTC One that I already took back because the capacitive keys stopped working within the first 10 days. Like I can't win- I just want a 32 gigabyte Nexus. So frustrating everytime I give a skinned version of Android a chance- I always have to deal with some stupid annoying thing that shouldn't be happening in the first place. It never fails :-/