Vista 64 Home Wireless Router: New Problem

If anyone has any thoughts on the following, would be much appreciated.

Over the past week, I have noted a new problem using my HP Pavillion
notebook running Vista Home Premium 64 bit on a home network.

Specifically, when I initially boot up, I am encountering frequent occasions
whereby the wireless device identifies the name of my Linksys home router,
but cannot connect for either local or internet access...running "repair" and
"disconnect/connect" do not solve the problem...if I then reboot, it
typically works fine.

I imagine there will be some data I can provide to help in troubleshooting
this, so if so, please let me know.

Thanks in advance for any suggestions.

Peter