(2012) AirPort Express disapears off network

So I have one of the new Apple TV style AirPort Express's and it's only purpose is to stream music. Unfortunately everytime something is played from a computer it completely drops off the network. (Signal strength is about 74% before dropping)
My routers status page and Airport Utility show no connection from the AE whatsoever, yet the AE status LED stays Green.  The only way to get it back up is to pull the plug.
The most annoying part of this is I have 3 Apple TV's that work perfectly, all the time! Suggestions are very welcome.
(Note that I've already tried disabling IPv6 on the Mac)
Hardware:
Asus RT-N16 w/ DD-WRT build 14929
2012 AirPort Express w/ Firmware 7.6.2
2012 MacBook Air w/ OS X 10.8.1
AirPort Info:
Wireless Mode: Join a Wireless Network
Routing: Bridged
SNR: 54; -34 Signal, -88 Noise (as reported from Router)
Assigned IPv4: Static
IPv6 Mode: Local-Link Only
AirPlay: No password set
Router Info:
Network Mode: NG-Mixed, 2.4GHz, 20MHz channels
Encryption: WPA2-PSK (AES)
ACK Timing: 100 meters
Beacon: 100ms
CTS Protection: Disabled
Preamble: Short
Shortslot: Short
SPI Firewall On: Set to filter Multicast & Port 113 (IDENT)
VPN Passthrough: Disabled
UPnP: Enabled
TCP timeout: 360 Seconds
UDP timeout: 120 Seconds
DHCP Lease: 720 Minutes (Not that this matters with a Static IP)

Update:
Tried rebooting the router multiple times, doing a factory reset and all 3 primary 2.4GHz channels. Then I downloaded the pervious version of AirPort Utility (AU 6.x is missing logging) to check the logs but when the AE restarts the logs get cleared.
Also when the dam thing dies it takes the entire network with it for about 45 seconds; the link speed on the router drops from 144Mbps to <1.

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