Samsung Galaxy S3 new firmware, advise needed

My phones giving me plenty of problems so I thought I'd try a reflash to try and sort them.

Which is the best simplest Firmware for a Galaxy S3 GT-I9300 ?, I'm running EHNDROIX V 14.10.23 on Android 4.4.4 (CyanogemMod 11)right now. I'm no Android buff so I dont need all bells and whistles, I just need it to run OK and stop the bloody camera from saying;- "Not Found" and the random crashes to end.

I should say I'm not very Android savvy but I'm OK flashing a phone

flash the mk6 stock rom via odin and all your problems will disappear.

really keep at it