Keep Getting Disconnected from wireless internet!!!

I Just bought a new dell inspiron 15 (7579). I have been having constant trouble staying connected to my home internet. Every other device hasn't had any troubles besides this laptop. I thought i might have had a defective network card so i exchanged it for a new one (same model).. Still having the same issues. I have reached out to my ISP but everything is running fine with modem/router.. I have ran diagnostics tests from dell's website with no success. This is beyond frustrating! 

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