Linksys Wireless Router :: WRT54G3G-ST Internet Explorer Cannot Find Web Page

This issue just started happening.  I have a Sierra Wireless Aircard 595 plugged into a WRT54G3G-ST.  I will be browsing the internet and all of a sudden, I get the message that Internet Explorer cannot find the web page.  At that point, I cannot get to any website.  I have several PC's, both wired and wireless connected and they all have the same problem,.  I have tried Google Chrome, Firefox and IE9 and all browsers have the same issue.  My email continues to download through Outlook, I can use WS FTP and I can also log in to a remote computer using Logmein.  It is just browser access that is affected. 
 
There is no set time table to the error.  Sometimes it happens within minutes, sometimes it is 30 minutes and sometimes it is over an hour.  The only way out of it is to either unplug the router, let it set 30 seconds, then plug it back in or I found that I can go into the setup and do a disconnect from mobile broadband and reconnect and it starts working again.  Of course, Sprint says they do not deal with issues unless the card is plugged directly into my PC, which is not the environment that I am running in (even though I bought the router and card from them.)  Does Linksys still make a mobile broadband router?