Problem with WLAN

I have HP Pavilion DV laptop. I have problem with WLAN on it. Sometimes WLAN starts and sometimes it doesn’t. My router’s WLAN is working fine. So there is some problem with WLAN on laptop. I have checked drivers and they are working fine and are updated to latest version. (Broadcom drivers)
Please suggest what might be the problem and solution for this.
Thanks in advance.