AC1900 C7000 WPS light keeps blinking

[schiok]

I have replaced my AC1900 C7000 twice but the problem still persists. The WPS light on the panel keeps blinking every other minutes, even though there is no devices trying to connect. I had asked Netgear customer service to help but so far they cannot solved the problem. Does anyone have the same issue? 

[TheEther]

Log into the router, go to ADVANCED > Advanced Setup > Wireless Settings and select Disable Router's PIN.

[schiok]

Thanks TheEther, but I have tried that method too but failed to solve the problem.