[Q] my tab4 10.1 is getting crazy!!! topic

Hi! Im having realy issues with my tab4 10.1 (sm t530). He keeps closing my apps like CoC , youtube, and other. Hes screen is allways turning on(goes for the lockscreen) sometimes doesnt lock. Already tried factory reset, works well for some time, and then goes back to the same. Pls someone help me.
Sry for my bad english.