I see this as a feature on the Linksys:
• Converts wired Ethernet-ready game consoles to Wireless-N network connectivity
• Works without drivers on Xbox, Xbox 360, PlayStation 2 or 3, and GameCube
• Dynamically changes channels and radio bands (2.4 GHz or 5 GHz) to find the fastest connection available
• Equipped with two ports: Power and Ethernet
• LED lights: POWER, ETHERNET, WIRELESS and SECURITY
• Has two internal antennae
• Supports WEP, WPA, WPA2 with TKIP or AES, WPS (Wi-Fi Protected Setup™)
Also this is probably ment to be directly connected to one of the game consoles mentioned in the list, not a router.
I presume this is causing wireless interferences. Having this in close proximity to the 827 is doing to be problematic at best and should it be correctly connected and wireless running, connections might not be good at best and would see problems in connections with devices.
You need to either use this adapter alone and connect it to a external Gb network LAN switch and disconnect the 827 router or use a wired LAN cable connection from Router A to Router B and not use the Linksys adapter in this configuration.
Preferred configuration would look like this:
ISP Modem>RouterA><Required LAN Cable (?ft)>RouterB>Wireless bridged<10ft min. safe distance between>Linksys Wireless Adapter><Lan Cable>connected to either a client device or a external network switch if the Wireless adapter supports this kind of connection platform.