I recently bought a asus RT-ac1200 router. Wired connections are fine but wifi connections have consistency issues. One test will show downloads of 8mbps and uploads of 40mbps, and the next test will show downloads of 40 and uploads of 40. I have 75mbps service. Speed test were checked on 2.4ghz and 5ghz. I live in a rural area and do not have any other networks near me. I have also tried changing channels to no avail. I have also run the tests on two different wireless devices. Firmware is updated as well. Any help would be apperciated