Router periodically stops working (partially)

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http://superuser.com – My home network consists of two Linksys wireless routers, let's call them A and B, and a switch, which provides ethernet connectivity to wired ports throughout the house. The internet cable connects to router A, which in turn connects to the switch to provide wired internet to the house. Router B is plugged in to some port in the house and is in bridge mode, to extend the wireless coverage. When I initially set this up, it worked great, you could walk around the house with a laptop and it'd seamlessly switch channels as needed to get the best wireless connection. After about a month, however, (HowTos)