A couple months back my Wifi range suddenly decreased by a large amount. At the moment it does not reach outiside of my room when it used to reach all the way across the house.

It was not moved. 

I have factory reset it a few times, nothing changed. (Used the backup file feature.)

Both 5G are set to the highest broadcasting range. ATF (Air Time Fairness) does not appear to change anything. Full 1,000 Duplex.

It has not effected the speed for anything on the Ethernet, only the wifi.

Just wondering if there is a possible fix, can attempt to answer any additional questions to perhaps find an answer.