Why my apps says not responding,blu grand xl

Why my apps say not responding and if i play rules of survival my messenger,google,facebook,rules of survival,gmail,and uc browser say not responding how i can fix it

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0