Microsoft has released Windows 10 Mobile preview build 14342.1004 to slow ring insiders. Mobile build 14342.1004 was released for fast ring insiders few days ago. Windows 10 Mobile preview build 14342.1004 contains mostly bug fixes.
— Windows Insider (@windowsinsider) May 31, 2016
Build 14342.1004 fixes a battery life problem that was affecting some devices. To download new build, go check your updates.