Hello, I purchased an AX1800 router a couple of years ago and HAD it connected to a different (NON-TP LINK) wifi extender. Just got a TP LINK RE315 extender today, added it using Tether, and everythin

Problem is that I now have no 5G wifi, only 2.4G? Purchased and installed this router last June, and ran it with no problems for about 9 months---until now. Suddenly lost internet, with red LED on uni