Default problem with my galaxy s4 ( SPH-L720)

hello folks how R yA

I have big problems in my G S 4 and it's really drive me crazy !!!!!

let me told you

when I bought my mobile it's galaxy s4 sph-L720 ( what is it 9500 or 9505 ?) then when get it it's works very good and fine and it's unlocked also ,,

but the problem is the mobile some time restart by self ??? and another big error which is the Camera ( when I try to record video) the phone is freezing for while then restart

I try many different rom's + I try CM 11 rom
it's the same,,, the mobile work good but the same problems (keep restart + camera record video mode error )

I am really get tiered of this I did all what can but ,,,, nothing works

Pleeeeeez my friends I need help I want a ROM that work good on my S4 (SPH-L720) and support many language ( because I am from UAE an and need Arabic language ) + solved all problem that I mentioned before

thanks my people in advance for help