aac and ac3 seem to cause the most problems SD and HD. I generally keep the nitrate around 2.5 Mb/s just for portability sake. container doesn't matter as avi, mkv, and mp4 all have the drops. I've used mx, BS, Archos, xbmc, and a few others and installed custom codecs if needed. heck even Netflix has a few frame drops. maybe I'm just too sensitive to it, but my s4, gn2, and gn8 have no problems. my old gn10.1 had no problems either. this 10.1 2014 is also the first Samsung device I've had that doesn't natively support ac3. hardware playback with alternative players do play the ac3 audio, but with dropped frames.