Comodo Firewall - Internet connection dropping

I have business and personal IBM laptops both using Windows XP professional IE 6 running on a home wireless network connecting through a BTVOYAGER 2000 router to the Internet. On my personal lap I keep losing the internet connection. The busines machine does not experience any problems. On the personal machine I can still connect to the router but cannot open pages with IE or replicate my mail. If I do a “repair” on the network connection that fixes the problem for a while. Can anyone help!