RT-AX88U Pro Dropping WAN Connection

I recently updated the firmware on my Asus RT-AX88U Pro to 3004.388.8_2. The router was working fine prior to the update, but immediately afterward, the WAN connection became unstable. It drops every few minutes, sometimes for just a couple of seconds, other times as long a minute. The LAN connection is fine, but internet drops. I tried reverting to version 3004_388.7_0, but that did not fix the connection problem. I've confirmed that the router is the issue by connecting a computer...

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