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 unit. Checked modem and lights were correct, but started troubleshooting: power down router and modem; disconnect ethernet cable and coax into modem, wait a few minutes, reconnect coax and reboot modem, once modem is up, replug ethernet and power up router. Shortly, router is up with correct (green) lights!

Opened Tether app on phone and verified that all seemed correct---and it did. Some of my devices weren't reconnecting automatically, so I looked at devices and found that all the ones that HAD been connected via 5G (Amazon Firestick, Roku, Amazon Fire tablet), no longer had that option. Rescan of available networks on those devices showed ONLY 2.4G (and TP-Link Extender 2.4G). No longer had the option of 5G or TP-Link Extender 5G! Rescanned numerous times, 5G just doesn't show up at all as an option? So, did my power down/unplug/power up/replug steps again, but this time I reset the router (hit recessed button on back).

After reset was complete, using computer, I logged into tplink.wifi.net and verified everything again, everything looks fine, and Network Map shows both 2.4 and 5G are active (lines present between Internet---AX1800---Clients). I checked for ugrades and completed a firmware upgrade, so everything is up to date. But still---no 5G option is available on devices? Everything is working OK on 2.4, but maybe tonight when my wife gets on her computer, Roku, and/or tablet and I'm on my Firestick and tablet at the same time, might be slower? But regardless, 5G should be there!

Can't think of anything I missed or didn't do. Having done the whole power down and up routine, including a reset, I'm at a loss. Any suggestions? Thanks!