while phone launcher can unfortunately stopped working don't worry about that...
1.First you do not put no launcher of unknown resources of downloading play store in launcher.
2.Any launcher can you use that affect a in built of phone launcher.
3.Do not download the android launcher on play store it has take to much of ram and battery
4.use only the phone launcher.
4.avoid useless application .
5.then restart your phone .
6.your phone works properly.