HD Video Playback Freezing/Stuttering Over Strong Wifi Connection

[clappingfetus]

Software
XBian version: 1.0 beta 2
XBMC version: 12.2
Overclock settings: Default

Hardware
Power supply rating: Nexus 5 Android Charger
RPi model (model A/B 256mb/512mb): Model B
SD card size and make/type: 16gb SDHC
Network (wireless or LAN): Wireless NETGEAR R6300 AC Router
Connected devices (TV, USB, network storage, etc.): Vizio TV via HDMI, USB Wifi Dongle, USB Keyboard

Problem description:
My problem is that I can not get any videos above 480p to play without stuttering and freezing every few minutes. I switched from Rasplex to Xbian because I was having this problem on there as well. I have a very powerful router that is in the adjacent room no more than 20 feet away. I have double checked all of my settings and I have tried to turn the resolution of the XBMC gui up and down to see if it had any effect and I don't seem to be able to figure out why all my HD videos are lagging.