Ive bad the Nexus 6 since the day it came out but just now got into the 4k video recording and i shot a few videos in 4k and when playing them back, the videos are choppy, laggy and auto focuses many times (does not look as good as 4k should). It's not terrible but definitely noticeable. I have seen other videos shot with this phone on youtube and they look perfect and professional. Much more clear and colorful and flowing smoothly. What am I doing wrong? Any tips for me to get mine looking like 4k should such as certain apps or settings? I'm having a kid soon and want to use my phone for recording instead of a camcorder.