crwdns2933897:0crwdne2933897:0

Screen lock won't turn on or off

My screen keeps blacking out at times and won't let me turn on or off... And when I go to start Google play musicians says system ui has stopped

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

crwdns2934109:0crwdne2934109:0

crwdns2853045:0crwdne2853045:0 crwdns2853046:0crwdne2853046:0
crwdns2889612:0crwdne2889612:0 1
crwdns2934285:0crwdne2934285:0