I have 2 WAP4400Ns that were manufactured in July 2007.  I've experienced some problems with dropped connections even with a strong signal over the years but recently, I've had long stretches where I cannot connect wirelessly to either unit.  It works for a few hours then can't connect for half the day.  I have no problem connecting to their admin pages over the LAN, just wirelessly.  I look at the units and the power light is steady green while the Ethernet and wireless lights flicker rapidly.  This looks no different when I can connect and when I can't.  Connectivity doesn't depend on location; I can put my laptop right next to one of the units when they are malfunctioning and still can't connect.  I tried changing the broadcast channel but it seems to have no effect.  I rentered the WEP key that I have used for years and it doesn't have any effect.  Settings are pretty much factory except for changing the IP address of one of them (so they can be in the same LAN) and customizing the SSIDs and security keys.

I've been an exclusively Linksys customer for my network hardware since the 802.11b days.  I've never had so many problems with equipment like I have with the 4400Ns.  I find it hard to believe that they would both fail simultaneously.  What else could be going on?

Firmware v 1.2.19