Dell wifi not working

I have a dell inspiron 15r 5521. I am facing issues with the network driver. Currently my wifi is working properly, but after few hours it stops working. A small yellow sign comes on the wifi icon. When i dicsonnect the wifi and try to reconnect, I cannot find any wifi networks to connect with. I have to restart my laptop every time this happens. During the restart it shows a blue screen stating power_state_driver_failure. I have tried to uninstall the network driver and re install it. In the network panel my ethernet port shows disconnected. I have been facing this issue for last 1 month. Kindly help.

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