My LG G4 (Sprint) that I have only had for a month was working fine until today. I was on an app (Snapchat) and the phone rebooted itself out of nowhere and since then has not completed a full reboot and has just been cycling through the LG startup screen and the screen after that which is the Sprint (Bright Yellow) Screen and just goes black after that and does that over and over and over again. I have tried the clear cache partition, I have even factory reset it from the recovery mode. My battery is good, I have never dropped my phone or got it wet. I just got the latest update about 2 or 3 days ago I believe. Don't know if maybe that's why? Help Please..