Ive marked it as beta 7 but in fact it happens on all 0.14 versions.
Two phones, minecraft from market on both with access to beta.
G2 and Note 3, android 5 official, not custom

When playing, every 5 minutes client phone get disconnected, while on the server side sometimes it says that the player left, sometimes player remain in the game doing nothing.
Also sometimes a synchronization problem occurs, client keep playing (New chunk doesnt load, chests cant be opened, but mob ai and interaction still works) while on server phone client player just disappears (But still listed in player list)

Tried both AP and Tethering connections, problems occurs in both connections and never occured in 0.13 actually