Suddenly down the wireless connection with wify router

Hi All,

I have a Dell Inspiron 15R N5110 laptop and Window 7. During connectivity of my wireless connection with wify router,  wireless connection is suddenly down although wireless work fine. My wireless show the wireless network connection but cannot connect with router anymore. It works again when I switch off the wify router and laptop and restart them. I need to restart the both of them again and again. No anti virus is installed in my laptop. I tried to uninstall the driver and install back, but it does not work . Anybody help be to get out from this problem.