galaxy s4 sometimes doesn't scroll/type? cpu and screen seem fine

I just replaced my broken screen with one I bought from china but I haven't used the phone for 5 months. anyway it works but my problem is that sometimes I can't scroll for 1-2 scrolls or I type and it even makes the sound of typing and vibrates so the touchscreen should be fine and it detects what I'm doing it just doesn't do anything. so I get feedback yet nothing happens. I tried watching full hd video on it and it works very nice so the cpu shouldn't have any problems either. no idea what could be the problem

god bless and thanks for any help

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