I am using a TP-Link Archer C7 v2 with firmware version 19.07.3
Every ~10 days the WIFI is down, while ethernet is up.
Nothing visible in the logs.
I solve it now by rebooting.
It looks like this is started after 19.07.3 installation.
I hope a newer firmware version will come out soon and solve this issue. Or I hope somebody can give me a tip how to solve it in the current version.
Here are some details about my system:
Model: TP-Link Archer C7 v2
Architecture: Qualcomm Atheros QCA9558 ver 1 rev 0
Firmware Version: OpenWrt 19.07.3 r11063-85e04e9f46 / LuCI openwrt-19.07 branch git-20.136.49537-fb2f363
Kernel Version: 4.14.180