I'm experiencing the following issues:

• Wifi signal is extremely weak. I can only connect to the wireless network when I am sitting next to the router. I can run a ping command in the terminal and watch it start to fail more and more as I walk away from the router. At about 10 feet I will only get request timeouts.
• All three wireless LED indicators are constantly flashing. It doesn't matter what radios are enabled or not, they're all flashing all the time.
• When multiple radios are enabled, my laptop and phone have trouble connecting to any one network. When only one radio is enabled, my laptop and phone are able to connect.

Here's a couple seconds from the system log indicating the LEDs are flashing:

2020-05-04 19:52:08 led-controller[1440]: <6> 288051 Start to run WIFI5G_2_OFF
2020-05-04 19:52:08 led-controller[1440]: <6> 288051 Start to run WIFI5G_OFF
2020-05-04 19:52:08 led-controller[1440]: <6> 288051 Start to run WIFI2G_OFF
2020-05-04 19:52:08 led-controller[1440]: <6> 288051 Start to run WIFI5G_2_ON
2020-05-04 19:52:08 led-controller[1440]: <6> 288051 Start to run WIFI5G_ON
2020-05-04 19:52:08 led-controller[1440]: <6> 288051 Start to run WIFI2G_ON
2020-05-04 19:52:08 led-controller[1440]: <6> 288051 Start to run WIFI5G_2_OFF
2020-05-04 19:52:08 led-controller[1440]: <6> 288051 Start to run WIFI5G_OFF
2020-05-04 19:52:08 led-controller[1440]: <6> 288051 Start to run WIFI2G_OFF
2020-05-04 19:52:08 led-controller[1440]: <6> 288051 Start to run WIFI5G_2_ON
2020-05-04 19:52:08 led-controller[1440]: <6> 288051 Start to run WIFI5G_ON
2020-05-04 19:52:08 led-controller[1440]: <6> 288051 Start to run WIFI2G_ON
2020-05-04 19:52:07 led-controller[1440]: <6> 288051 Start to run WIFI5G_2_OFF
2020-05-04 19:52:07 led-controller[1440]: <6> 288051 Start to run WIFI5G_OFF
2020-05-04 19:52:07 led-controller[1440]: <6> 288051 Start to run WIFI2G_OFF
2020-05-04 19:52:07 led-controller[1440]: <6> 288051 Start to run WIFI5G_2_ON
2020-05-04 19:52:07 led-controller[1440]: <6> 288051 Start to run WIFI5G_ON
2020-05-04 19:52:07 led-controller[1440]: <6> 288051 Start to run WIFI2G_ON
2020-05-04 19:52:07 led-controller[1440]: <6> 288051 Start to run WIFI5G_2_OFF
2020-05-04 19:52:07 led-controller[1440]: <6> 288051 Start to run WIFI5G_OFF
2020-05-04 19:52:07 led-controller[1440]: <6> 288051 Start to run WIFI2G_OFF

Things I've tried, none of which have improved the wifi signal strength issue:

• Power cycling the router.
• Upgrading the firmware. It was out of date this morning, and is now up to date.
• Only enabling a single wireless radio - this allows devices to connect to the network, but only when next to the router.
• Used a network diagnostic tool to find the best channel to use for 2.4 or 5GHz radios.
• Restore and Factory Restore, which are separate options under "Factory Default Restore".
• Setting QoS to standard from streaming.
• Enabling IPv6.
• Plugged into a different outlet with a different surge protector.

Other facts worth noting:

• This was purchased in July 2019.
• It is plugged into a Tripp Lite 12 outlet surge protector that still indicates it is protected.
• There have been some storms over the past week.
• Wired connections work just fine.

Potentially related - https://community.tp-link.com/us/home/forum/topic/193408