Sudden drop in Wifi internet speed while Ethernet speed is ok

Hello,

I'm experiencing a sudden drop of internet speed only through my wifi connected device. I use to have 200mbps on my wifi connected device but recently they have dropped down to 15mbps, tested in the same location where I got 200mbps before. I checked the speed on my wired connection device and they are running a steady 200mbps internet speed. I tried rebooting the router (nighthawk x10 R9000) but no use.

Any advice?

Thank you

You can log into your router and change the wifi channel. You might be getting interference on your currently selected one.