First thing to try is to check your system apps to see if they need updating use this:
SysApp Pusher | Windows Phone Apps+Games Store (United Kingdom)
Next you can try a soft reset, sometimes it helps: Hold volume button down and power button until phone vibrates then let go. Phone restarts. You may need to reset time and date.
If that doesn't work you can try a hard reset, this will erase everything on the phone. So be sure to use the backup service prior to doing this. It won't say game data.
Hard reset: Settings -> About -> Reset phone
If that doesn't help you can try NSU, Nokia Software Updater. Go here to download it. (ignore the title of the thread you just want the software) and the tutorial on how to use the software.
http://forums.windowscentral.com/wi...ng-gears-cogs-bug-nokia-lumia-users-only.html
You'll need a Windows 7 or 8 machine to use this software, a USB cord and a WiFi connection. This will completely wipe your phone and install a fresh firmware. Again be sure to backup.
If none of this works it means you have a bad phone and it needs to be replaced.
Keep in mind that stuff like this happens as no manufacturing process is perfect.