I'm facing same issue from this previous ticket "Archer AX10 (ax1500) power LED blinking". https://community.tp-link.com/en/home/forum/topic/235108

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Since yesterday my router started having some serious problems. It began with it factory resetting all of a sudden with all the lights turned off, then only power led blinking on and off. During this time, there are no wireless signals and hard reset does not do anything. Power cycle will just result in router turning on and then back to blinking power LEDs.

Only way I could somehow get it to show up that router browser page is to connect it to my laptop through ethernet port.

It would ask for a new password, region/date and ssid/wifi passwords. After the set up is complete, the router seemed to be back to normal. All the leds are solid on and suddenly power led starts to blink and the router shuts off and restarts. And I only get Power LEDs blinking on and off again. Right now, this router is useless to me and if it is not fixed soon, this is a waste of money and time.

I was able to somehow with dexterity, upgrade the firmware to the latest version that there was but it did not help. During the setup, I did not change anything and everything was just default with Dynamic IP.

I have tried everything I could think of from power cycling, hard reset, factory default, upgrading the firmware, even having one device connected to 2.4G or 5G at a time. Nothing would solve this. There are no issues with my ISP because when I use ethernet cable to bring the router back to life for a brief period of time, I have connection.

I do not understand what is causing the factory resets and why is it that I have to connect it to a ethernet port for the router to work ? (It still dies after less than half an hour)

Before I had this problem, the router was working perfectly fine with maintaining high speeds to 3 devices connected to 2.4G and 2 devices connected to 5G

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