WMP300N's not maintaining connection to WRT300N

I have two WMP300N's connecting to a WRT300N via wireless, and several computers that connect via CAT-5.  The WRT300N has DHCP enabled.
The computers connected via wire get an IP address just fine and everything in that regard is working fine.
The two computers connecting wirelessly are both a very short distance from the WRT. Both report "Excellent" signal strength (84% or better). And both of them CONSTANTLY lose their connection to the WRT about ever 2-3 minutes, then go through a period of reconnecting and getting reassigned an IP address.  In the meantime, of course, any tcp connection I have established with a remote site stalls until the wireless computers can get their IP address back.
I have the latest firmware on the WRT, and the latest drivers on the WMPs.
Why are these wireless connections to flaky and, more importantly, what do I need to do to get a stable wireless connection established and maintained?
Is the "N" protocol still a garbage spec? Do I need to force it to drop back to an 11g connection to get something reasonably stable?

Hi
As you are facing frequent connection dropping issues, first of all make sure you hardwire one of your computers directly with your router, then launch Internet explorer and clear address bar and type in 192.168.1.1 and password as admin and then click ok.
Click on wireless tab and then change Radio band to Wide – 40MHz channel, Wide channel to 9 and standard channel to 7 or 11. Now check the connection. If you get good connection without dropping then no issues, but if not then again enter the router setup page and click on wireless tab and then click on sub tab Advanced wireless settings, reduce Beacon interval to 75, RTS Threshold to 2307 and Fragmentation Threshold to 2306 and save settings and now check the connection.

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