When trying to play MCPE 0.12.1 build 9 local multiplayer over WiFi sometimes it won't connect like the server won't pop up on the other player screen on Motorola razor HD android 4.4.2

When trying to play MCPE 0.12.1 build 9 local multiplayer over the same WiFi the server the person make doesn't pop up on the other persons screen to join the server on android 4.4.2 Motorola razor HD plz fix I want to play local multiplayer on MCPE 0.12.1 build 9