Linksys wrt54g Problem

Hello,
I think the problem is with my Linksys router. But my problem is that when I'm playing a game online, sometimes I will get disconnected in the middle of the game. I'm running Windows XP on both my computers, and the game I noticed this on is Warcarft 3. I first noticed it happening at a cousins house I was visiting. I was connected wirelessly to a wrt54g router, and I would get disconnected from Battle.net, but my internet would be fine. Sometimes I could be on for a few hours with seemingly no problem, sometimes it would happen within half an hour. Then when I got back to where I live, even my desktop which is plugged into a Linksys wrt54g router would disconnect while playing. This would happen even when I was the only one connected to the router, at any times during the day. Both times I think that the router was using version 1.0 firmware. Any help regarding this would be nice, it's rather annoying to be getting disconnected often like this.