General :: Galaxy S3 Getting Stuck In Sleep Mode / Locked

I had it first on the Galaxy S3 with 4.2.1 stock rom, I don't know if it might be an app that might be causing this, basically when i lock the phone the screen turns off but then when i press the power button or the home button to turn on the screen it does not do anything, I know the phone is still on because sometimes if i get a text message i can see the blue led blinking and it will continue to blink even when it's frozen.

The only way to bring it back is by holding the power and home button together in order to reset it.I tried factory reset and it would not work, I flashed the phone with a custom rom for Paranoid Android 4.3 and it worked great for about a week, no issues at all, but then it started freezing when locked again.

I don't know if it might be an app that might be causing this, basically when i lock the phone the screen turns of but then when i press the power button or the home button to turn on the screen it does not do anything, I know the phone is still on because sometimes if i get a text message i can see the blue led blinking and it will continue to blink even when it's frozen.

Even worst, if i'm listening to music and i lock the phone or if the screen times out and locks when i try to unlock it i can see it's stuck but the music is still playing....

Also, if the phone is stuck and i try to call it, it will not ring not turn the screen on, it's not like the problem is just the physical buttons, i don't know what to do since the phone is out of warranty, I have never dropped the phone and there is no damage on it, it have never over heat either so i don't know what can i do...