@TP-Link I contacted the customer service, and manually updated to the Fireware to the latest version (manually installed, auto update won't find it). It has been three days, so far so good. Besides...

We have M5 AC1300, main connects to the modem. Another one upstairs. The one connects to the modem keep dropping from the Internet every couple days, and the LED is Red color. I have to power off the...