I also had a perfectly good GS4 from Verizon. Worked great until the update Monday morning. Then it would randomly lock up and reboot 3-4 times a day. I went thru all my apps, restarted, pulled battery multiple times, no help. On Thursday I figured I would do a FDR because I know that's the first thing they would tell me to do even though a FDR has never solved a device issue that I have ever had. Anyway, right after the FDR while setting up my phone, it locked up. While loading apps, it locked up then rebooted. It was worse than before. So I called tech support, told them everything I did and they sent me a new phone. Only problem is they sent me the Note 2. My gf has the note 2 and happened to have a spare battery but I still need a back cover, have it in an otterbox right now with no back cover. Debating if I should keep the Note2 or call monday and let them know what they did.