Android Box S805 Audio/Video out of SYNC

What is going on? Video/Audio is out of SYNC on few channels while others play OK. I have tested with VLC, and VLC playing OK those few channels. IJKPLAYER is the only option for now. Please don't offer buggy external player since its paid in the a** to switch back to STB EMU from external player with remote. HOW to FIX SYNC ISSUE on those few channels???