Go to samsung-updates.com then search for I9300 then there should be a collection of firmware.
NOTE: That collection is VERY VERY LONG. It may take you awhile to find your country and android version. Don't rage quit XD
After that click download...
Did you check Auto-Reboot before flashing? If no then your installation method is improper. Just do it again.
If yes then wait, the OS is optimizing apps for the dalvik cache is wiped. If you wonder why cache is wiped it's because it is a step in...
Fast and good batery life. Best rom i ever flashed on s3
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More people prefer AR-HD when it comes to I9300 JB ROMS. But ArchiDroid 2 is KitKat and it is quite fast and stable...
Its CM10.1 man. It might be that your s3 already got old and a part of its hardware suddenly fails (If you only installed CM10.1 and did not tweak the ROM after ). It's normally happening to a few I9300's everyday. It was yours that was chosen to ...
Here is your nice looking link: