If you have got some problems with your samsung galaxy S III, you can use the “Safe Mode” to determine whether a 3rd party application is the cause of an Operating System / Application issue.
With the Safe mode, You can disables all application that have been installed.
How to enable Safe Mode on Samsung Galaxy S III?
Step 1, Power Off your galaxy s iii
Step 2, Press and hold the Power button until the Samsung logo appears then release.
step 3, With the Samsung logo on-screen, press and hold the Volume down key.
Step 4, Continue to hold the Volume down key until Safe mode appears in the lower-left of the unlock screen then release.
You can test your device functions. If previous problem solved, that means it is some of your apps cause the problem. and then you can try to uninstall each apps and test the device again.
wish this helps!