I am having multiple issues with my S3 and I am getting it replaced...but until then hopefully someone can help with this issue. Every single night the phone constantly shuts down and restarts by itself. It only happens at night and does it even if I'm on it playing a game. It happens in an area In my house where I get the No SIM Card message so I'm not sure if that is related??? Any suggestions would be great as I have to be accessible 24/7 for work so turning it off isn't really a viable solution. I contacted Samsung over the weekend and they had me do a hard reset and assured me that all of my issues would be resolved but it didn't resolve any of the issues.