Can I get some help with my LG G3 authentication problem?

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AC Question

LG G3 Authentication Problem. Help.

My LG G3 will not for anything connect to my home wifi. I have the Netgear WNDR3400v2 router (N600). I keep getting the "Authentication Problem" message every time I try to connect to my wifi. Every other device I own connects no problem. Never had a problem like this before. I even connected a phone earlier that day to it no problem. Help please!

THINGS I HAVE TRIED:
*Airplane mode trick
*Resetting phone and router also factory reset phone.
*forgot and retried entering password.
*I did the Google Framework Service Clear data trick.
*Tried changing security protocol in Router settings to WPA/None/WPA2.

Please don't tell me to check if I put in the right password... I've been using the same password for 3 years and it's not hard...

I do not know what else to do.... And I love this new phone.