We do have such posts in our networking forum and the usual fix is to swap in a new wifi laptop card, clean the laptop vents. But details are far too slim in your post.
Not exactly sure what the problem is here, but, my wireless doesn't stay connected for more than an hour or so before it boots me offline. I have been trying the Windows 7 network troubleshooting and all it can muster is a vague explanation. I have to reboot constantly now in order to reset my Wifi card. When I was at the Tech Net site the other day I found out I am not the only person having this problem, but, there were no explanations as to the cause or a fix. Even System Mechanic can't figure it out and I just wasted thirty dollars on that this morning. When I was using Vista I could stay connected for weeks on end without dropping.