Linksys Wireless Router :: WRT120N Losing Wireless Connection To PC's

I'm running Windows 7 64bit and I have sucessfully configured my wireless print server (Linksys WPSM54G) to work with my computer and our HP DesignJet 500ps.  I have been able to print several sets of drawings without issue, however if the plotter is inactive for an extended period of time (1 hour +/-) the wireless print server loses connection with our router.  At the same time the print server loses connection, an associate in our office with a wireless connection to his computer also loses connection to the router.  A simple power cycle of the router and print server restores the wireless connection
 
I chatted with Linksys online tech support and they confirmed that I had the most recent firmware in both the router and print server and had me reconfigure some of the wireless settings on the router.  All was good until about an hour ago when I tried to plot and discovered that the print server had lost it's connection to the router and my associate had also lost his wireless connection.
 
What's the deal here?  I feel as though the root cause of this issue is related to the wireless router rather than the print server as my associate was periodically losing connectivity to the wireless router before installing the print server.