crwdns2933897:0crwdne2933897:0

Why is my overview button and home screen not working

my over view button and my home screen button and notification place doesn't work one day I just put of my phone and put it on and all of a sudden it stopped working I will receive messages

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

crwdns2934109:0crwdne2934109:0

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