The WiFi on the 2.4GHz band of our AX20 router has recently started dropping out completely. It's a complete loss of signal for anywhere from 10-30 seconds -- over -90dBM signal strength. This happens anywhere from 3-10 times per hour. The 5GHz band is unaffected and outputs at a steady -28dBm throughout with no droputs. This is measured from my desk which is less than 6 feet away from the router.
Currently, our 2.4GHz band is broadcasting on channel 9. There are three nearby signals broadcasting on channel 1. There is no router interference that I can see near this channel. I use NetSpot app to check our neighborhood's WiFi.
I've rebooted. Powered off and rebooted. I've reinstalled the firmware with a fresh copy. These did not fix the problem. I adjusted the RTS threshold to 2304 and the Beacon Interval to 75 from the default values; this may have helped a little bit, but the droputs still persist.
This is causing problems with some of our smart appliances. This is our second TP-Link router with this issue. Any ideas on what can I do to fix this? Thank you in advance for your help.